The persistent feeling that you are sitting on a ball, lump, or some invisible object usually traces back to one of a handful of conditions involving the pelvic floor muscles, the nerves running through the pelvis, or the lower rectum. It is not a quirk of imagination. In clinical literature, patients describe it as sitting on a “golf ball” or “tennis ball,” and the description is common enough that researchers have given it a formal name. The causes range from muscle spasm to nerve irritation to inflamed rectal tissue, and sorting out which one applies to you depends on the character of the sensation, when it appears, and what else accompanies it.
The Pelvic Floor Is Usually Where the Story Starts
Your pelvic floor is a hammock of muscles stretched across the base of your pelvis. These muscles support your bladder, rectum, and (in women) the uterus. When they work normally, you do not notice them. When they go into chronic spasm or develop tight, irritable spots, the sensation can feel exactly like sitting on something hard. The most recognized version of this is levator ani syndrome, a condition in which the levator ani muscle, the largest muscle in the pelvic floor, develops persistent spasm and trigger points that produce chronic pain in the anal and perineal region.1PubMed Central. Levator Ani Syndrome Presenting with Vaginal Pain Classic symptoms include rectal pain or pressure that worsens with sitting.2PubMed Central. Atypical Presentations of Levator Ani Syndrome With Perianal Hyperhidrosis: A Case Series
What makes levator ani syndrome frustrating is that there is often nothing structurally wrong. No lump, no mass, no abscess. A doctor pressing on the levator ani during a rectal exam can usually reproduce the pain, which helps confirm the diagnosis but does not immediately explain why the muscle decided to seize up. Stress, prolonged sitting, prior surgery, and childbirth are all recognized triggers, though in many cases no single cause is ever identified. The condition goes by a confusing number of aliases, including puborectalis syndrome, chronic proctalgia, and pelvic tension myalgia, which reflects how long clinicians have struggled to pin it down.
Pudendal Neuralgia and the “Golf Ball” Feeling
If the sensation is specifically that of a foreign object lodged in the perineum, vagina, or rectum, pudendal neuralgia deserves serious consideration. The pudendal nerve runs from the lower spine through the pelvis and branches out to the genitals, perineum, and anus. When it becomes compressed or irritated, it can generate the vivid feeling of sitting on a golf ball or tennis ball. Clinicians dealing with this complaint encounter it so regularly that researchers coined the term “allotriesthesia,” from the Greek words for “foreign” and “sensation,” to describe it.3Journal of Global Library of Women’s Medicine. Pudendal Neuralgia – Section: Symptoms
Pudendal neuralgia tends to follow a recognizable pattern. The discomfort usually worsens when you sit and improves when you stand or lie down. It can be one-sided or central. It often comes with burning, numbness, or a pins-and-needles quality that muscle-based conditions do not produce. Cycling is a well-known aggravator because the saddle compresses the pudendal nerve against the ischial spine. People who sit for long hours at a desk, especially on hard chairs, may also develop symptoms gradually.
The tricky part is that pudendal neuralgia and levator ani syndrome overlap. A compressed pudendal nerve can cause secondary muscle spasm in the pelvic floor, and chronically spasming muscles can compress the nerve. This chicken-and-egg problem means that many people end up with features of both conditions at once, which complicates treatment.
When the Rectum Itself Is the Problem
Not every “sitting on something” sensation originates in the muscles or nerves. The rectum sits right above the pelvic floor, and conditions affecting it can produce fullness, pressure, or a feeling of a mass that is especially noticeable when you sit down.
Hemorrhoids are the most common culprit in this category. Internal hemorrhoids that prolapse, or external hemorrhoids that become thrombosed, can feel exactly like a lump you are sitting on. The sensation is usually accompanied by other signs like bleeding with bowel movements, itching, or visible swelling near the anus. After procedures to treat internal hemorrhoids, a temporary feeling of anal fullness is common and tends to resolve within a week, though it can be distressing while it lasts.4Frontiers in Medicine. Kangfuxin solution perianal warm moist compress combined with music therapy for anal fullness after endoscopic treatment of internal hemorrhoids
Chronic proctitis, which is persistent inflammation of the rectal lining, can also generate a sense of rectal fullness and pressure. It comes in several forms, the most common being ulcerative proctitis (a limited form of ulcerative colitis), chronic radiation proctitis (a late side effect of pelvic radiation therapy), and diversion proctitis (which can develop in a segment of bowel that has been surgically bypassed).5PubMed Central. Pathogenesis, diagnosis, and management of ulcerative proctitis, chronic radiation proctopathy, and diversion proctitis These share overlapping symptoms of urgency, bleeding, and a feeling that something is constantly present in the rectum.
Proctalgia Fugax, the Fleeting Version
Some people experience the sensation not as a constant companion but as sudden, intense episodes of rectal pressure or pain that vanish within minutes. This pattern fits proctalgia fugax, a condition characterized by brief but severe rectal pain thought to arise from involuntary spasm of the anal sphincter or puborectalis muscle.6PubMed Central. Proctalgia fugax Episodes often strike at night or without warning, last anywhere from seconds to tens of minutes, and resolve completely between attacks. The cause remains poorly understood, but the experience can be alarming. If your “sitting on something” feeling is episodic and intense rather than constant and dull, proctalgia fugax is worth mentioning to your doctor.
Tailbone Pain That Mimics a Lump
Coccydynia, or tailbone pain, creates a focused ache right at the base of the spine that can feel like sitting on a hard object, especially on firm surfaces. The condition is roughly three times more common in women and in people carrying extra weight.7Fizjoterapia Polska. Effect of low-level laser therapy on sitting tolerance and activities of daily living in individuals with coccydynia A fall onto the tailbone, prolonged sitting on narrow or hard seats, and childbirth are the usual triggers.
Coccydynia is distinct from pelvic floor spasm in that the pain is bony and localizable. If you press on the very tip of the coccyx and it hurts, or if the sensation reliably appears only on hard chairs and disappears on cushioned ones, the tailbone is the likely source. It can coexist with pelvic floor problems, though, since the levator ani and other pelvic floor muscles attach directly to the coccyx. Chronic coccyx pain can cause those muscles to guard and tighten reflexively, layering muscle spasm on top of the original bony pain.
How Your Nervous System Can Amplify the Problem
In some people, the “sitting on something” sensation persists or intensifies even after any original injury has healed. This is where the nervous system itself becomes part of the problem. Research into chronic pelvic pain has found evidence of central sensitization, a state in which the central nervous system becomes hyperexcitable and amplifies normal sensory signals into pain or abnormal sensations. Studies in patients with chronic pelvic pain have documented altered brain structure and function, heightened sensitivity to multiple types of stimuli (not just pelvic ones), and disrupted autonomic regulation.8Pain Physician. Central Sensitization In Urogynecological Chronic Pelvic Pain: A Systematic Literature Review
A related concept is visceral hypersensitivity, which plays a major role in irritable bowel syndrome. In people with visceral hypersensitivity, normal stretching and movement of the gut registers as pain, pressure, or fullness. This can create a chronic sense of rectal fullness or perineal pressure even when the rectum is empty and structurally normal.9PubMed Central. The Role of Visceral Hypersensitivity in Irritable Bowel Syndrome: Pharmacological Targets and Novel Treatments If you have been diagnosed with IBS or have other functional gut symptoms like bloating and altered bowel habits, the sitting-on-something feeling may be part of that broader picture rather than a standalone problem.
The practical implication is that searching for a structural explanation sometimes hits a dead end. A doctor may find nothing on imaging or physical exam, and that does not mean the sensation is invented. It means the nervous system is generating a real, physical sensation from signals that do not correspond to tissue damage. Recognizing this is important because the treatment approach is completely different from treating a hemorrhoid or a fracture.
Post-Surgical Causes Worth Knowing About
If the feeling started after a pelvic surgery, the surgery itself may be the explanation. Procedures involving mesh implants for pelvic organ prolapse or stress urinary incontinence are a recognized source of chronic perineal and pelvic pain. In a study of patients experiencing mesh-related complications, all had pain-related symptoms after surgery, including perineal pain, pain during intercourse, and difficulty with urination or defecation.10PubMed Central. Treatment and outcome of polypropylene mesh or tape related pain after reconstructive pelvic surgery Mesh can erode, contract, or trigger local nerve irritation, any of which can produce the sensation of something being physically present where it was not before, because in this case, something literally is.
Other pelvic surgeries, including hemorrhoidectomy, hysterectomy, and prostate procedures, can also leave behind scar tissue or nerve changes that alter the sensation of sitting. If your symptoms have a clear before-and-after timeline around a procedure, that connection is worth raising with the surgeon or a pelvic pain specialist.
How This Gets Sorted Out
A doctor evaluating this complaint typically starts with a careful history and physical exam. A digital rectal exam can identify hemorrhoids, rectal masses, and pelvic floor muscle tenderness. If the levator ani reproduces your pain when pressed, that points toward levator ani syndrome. If the coccyx is tender, coccydynia is more likely. If there is a neurological pattern, nerve-specific testing or diagnostic nerve blocks may be used to confirm pudendal neuralgia.
When the diagnosis is not obvious from the exam alone, further testing can include anorectal manometry, which measures pressures and sensory thresholds in the anal canal, and dynamic pelvic imaging such as defecography, which visualizes how the pelvic floor structures behave during evacuation.11PubMed Central. Diagnosis and treatment of pelvic floor disorders: what’s new and what to do These are usually reserved for cases where symptoms are severe, persistent, or not responding to initial treatment. For most people, a thorough physical exam and history narrow the field enough to start treatment.
Red flags that warrant faster evaluation include new rectal bleeding (especially in someone over 45 or with a family history of colorectal cancer), a palpable mass, progressive neurological symptoms like numbness spreading down the legs, or unintentional weight loss. These can signal conditions beyond the functional and musculoskeletal diagnoses discussed above.
What Actually Helps
Treatment depends entirely on what is causing the sensation. For levator ani syndrome, pelvic floor physical therapy is the cornerstone. A trained pelvic floor therapist can identify trigger points in the muscles, work on releasing them through internal manual therapy, and teach you how to relax muscles you may not realize you are clenching. This is not the same as general strengthening exercises like Kegels, which can actually make pelvic floor spasm worse if the muscles are already too tight.
For coccydynia, cushioned seating (especially wedge-shaped or coccyx cutout cushions) provides immediate relief during the healing process. Physical therapy approaches using ultrasound or laser therapy have shown significant improvements in sitting tolerance and daily functioning in studies, though the gains vary by modality.7Fizjoterapia Polska. Effect of low-level laser therapy on sitting tolerance and activities of daily living in individuals with coccydynia
Pudendal neuralgia often responds to a combination of nerve-calming medications (such as low-dose tricyclic antidepressants or anticonvulsants), physical therapy to decompress the nerve, and avoidance of aggravating activities like prolonged sitting or cycling. In refractory cases, pudendal nerve blocks or surgical decompression may be considered.
When chronic functional anorectal pain does not respond to conservative measures, botulinum toxin injections into the pelvic floor muscles are an option. In a study of over 100 patients with chronic functional anorectal pain, roughly half experienced a good outcome from botulinum toxin treatment, with about a fifth getting temporary relief and a third seeing no benefit.12SpringerOpen / Techniques in Coloproctology. Botox treatment in patients with chronic functional anorectal pain: experiences of a tertiary referral proctology clinic Nearly half of the patients who responded well needed only a single injection, though some required multiple rounds.
For visceral hypersensitivity related to IBS, treatment targets the nervous system’s overreaction rather than any structural problem. This can include gut-directed hypnotherapy, low-dose neuromodulating medications, dietary changes, and cognitive behavioral approaches. The evidence for managing visceral hypersensitivity suggests that reducing the nervous system’s alarm response can meaningfully reduce symptoms.9PubMed Central. The Role of Visceral Hypersensitivity in Irritable Bowel Syndrome: Pharmacological Targets and Novel Treatments
The Role of How and Where You Sit
Sometimes the problem is not internal at all, or at least not entirely. Prolonged sitting on poorly designed surfaces can compress the perineum and pudendal nerve, creating or worsening the very sensations described above. This is especially relevant for cyclists, where saddle design has a documented effect on perineal pressure. Research on bicycle saddle pressure found that the impact of riding position and saddle shape differs between men and women, with trunk position affecting saddle pressure in men using certain saddle designs but not in women.13Karger Publishers (Urologia Internationalis). Bicycle saddle pressure: effects of trunk position and saddle design on healthy subjects The takeaway is that seat geometry and posture matter, and they matter differently depending on anatomy.
For non-cyclists, office chairs with narrow, hard seats and no tilt adjustment can concentrate pressure on the perineum and coccyx. Standing desks, sit-stand alternation, and pressure-relieving cushions are all low-risk interventions worth trying before pursuing any medical workup. If the sitting-on-something sensation vanishes when you change chairs, you may have your answer without ever seeing a doctor.
Why This Sensation Gets Dismissed and What to Do About It
One of the more frustrating aspects of this complaint is that it often gets dismissed, especially when initial exams and imaging come back normal. Patients may be told the problem is psychological or simply given reassurance that nothing dangerous is going on. That reassurance is technically accurate in most cases, but it misses the point: the sensation is real, it interferes with sitting and daily life, and there are identifiable mechanisms and effective treatments for most of the causes.
If you have been brushed off, asking for a referral to a pelvic floor physical therapist or a pelvic pain specialist can change the trajectory. These providers are trained to evaluate the muscles, nerves, and connective tissue of the pelvis in ways that a general practitioner’s exam may not cover. A pelvic floor therapist, in particular, can assess muscle tone, identify trigger points, and distinguish between an overactive pelvic floor, a nerve problem, and a structural issue like coccyx instability. For many people, this is the appointment that finally puts a name to the feeling and a plan behind the name.