Pain under a fingernail when you press on it usually comes from inflammation, trapped blood, infection, or a growth in the nail bed, and identifying which one matters because the treatments are completely different. The nail plate itself has no nerve endings, but the nail bed directly beneath it is packed with sensory receptors, which is why even mild swelling or a tiny lesion there can produce surprisingly sharp pain on pressure. Some causes are obvious and short-lived, while others linger for months or years before anyone figures out what is going on.
Everyday Causes That Are Easy to Overlook
The most common reason for pain under a fingernail is some form of trauma you may not even remember. Catching your finger in a door, hitting it with a hammer, or even repeated tapping on a keyboard can bruise the nail bed and leave a pocket of blood trapped beneath the nail plate. That pocket, called a subungual hematoma, creates pressure in a very confined space, and pressing on the nail pushes it down against the swollen tissue. The pain can be extreme, and the nail often turns dark purple or black. If the blood collection is large enough, draining it through a small hole in the nail gives substantial relief.1PubMed. Controlled nail trephination for subungual hematoma
Infection is the other frequent offender. Paronychia, an infection of the skin fold around the nail, can start from something as minor as a hangnail, an overly aggressive manicure, or a small cut near the cuticle. Acute paronychia comes on fast with redness, swelling, and throbbing pain that gets worse when you press the nail or the surrounding skin. If an abscess forms, it sometimes drains on its own, but many cases need a doctor to open and drain the pocket and prescribe a short course of antibiotics.2Journal of the American Academy of Orthopaedic Surgeons. Acute and Chronic Paronychia of the Hand Chronic paronychia, on the other hand, develops gradually, often in people whose hands are frequently wet, and the pain tends to be milder but persistent.
Repetitive low-grade trauma deserves a mention too. Musicians who pluck strings, people who type aggressively, and anyone who habitually picks at their nails can develop a low-level ache under the nail plate. The pain might not be dramatic, but it tends to flare every time you press or grip. Nail pain in general can show up as throbbing, burning, sharp, or shooting, and it often gets worse with cold temperatures or when you manipulate objects.3International Journal of Dermatology. Painful nails: A practical approach to the diagnosis and management of painful nail conditions
When Cold and Touch Make It Worse
If your fingernail pain is intense, pinpoint, and has been going on for months without an obvious injury to explain it, there is a diagnosis that doctors sometimes miss for years: a glomus tumor. These are small, benign growths that arise from the glomus body, a tiny structure involved in regulating blood flow and temperature in your fingertips. Glomus tumors are rare in the grand scheme of things, but among tumors found under the fingernail, they are one of the most common, and they produce pain that is wildly disproportionate to their size. Some are as small as a few millimeters across.
The hallmark of a glomus tumor is a triad of symptoms: sharp localized pain, sensitivity to cold, and exquisite point tenderness.4Radiology Case Reports. Glomus tumor: A rare differential diagnosis for subungual lesions The cold sensitivity piece is distinctive. Reaching into a freezer, holding an iced drink, or even a gust of cold wind can trigger a bolt of pain in the affected finger. Minor bumps to the fingertip that would be trivial for anyone else can cause severe, sometimes tear-inducing pain.5PubMed Central. The hidden cause of chronic finger pain: Glomus Tumor – A Case Report People sometimes describe it as an electric shock or a burning sensation concentrated in one tiny spot.
Because the tumors are so small and often invisible on the surface, patients frequently bounce between doctors for months or years before getting a diagnosis. The nail might look completely normal, or there might be a faint bluish or reddish discoloration under the nail plate. In some reported cases, glomus tumors have even mimicked Raynaud’s phenomenon, the condition where fingers turn white and numb in the cold, which can send the workup in the wrong direction entirely.6PubMed Central. Glomus Tumor Presenting as Raynaud’s Phenomenon
How Doctors Test for a Glomus Tumor
The good news is that a few simple bedside tests are remarkably accurate at identifying glomus tumors, and none of them require any special equipment. The most well-known is Love’s pin test: a doctor presses the blunt end of a pin, a paperclip, or the tip of a ballpoint pen against different spots under the nail. When the pin lands directly over the tumor, the pain is immediate and severe. In published case series, Love’s pin test has been positive in every single patient who turned out to have a glomus tumor.7PubMed Central. Subungual Glomus Tumours: Is Magnetic Resonance Imaging or Ultrasound Necessary for Diagnosis?
The cold sensitivity test is equally straightforward: the hand is dipped in cold water or an ice cube is held against the fingernail. If the pain ramps up dramatically, the test is positive. One series of patients found that the cold sensitivity test had perfect sensitivity and specificity for glomus tumors.8PubMed. Glomus tumour of the hand Hildreth’s test takes a different approach: a blood pressure cuff is inflated on the upper arm to temporarily cut off blood flow, and then the tender spot is pressed again. If the pain disappears while the cuff is inflated and snaps back the moment it is released, that strongly suggests a glomus tumor. In clinical studies, Hildreth’s test has been positive in roughly 77 to 89 percent of confirmed cases.9PubMed Central. Clinical, histopathological and immunohistochemical features of glomus tumor of the nail bed
What makes these tests useful is that they rely on the clinician’s examination rather than expensive imaging, and when all three are positive together, the diagnosis is quite reliable. A doctor who is familiar with glomus tumors can often identify one in a single office visit. The problem is that many clinicians, especially those outside dermatology or hand surgery, do not think of glomus tumors when a patient mentions fingertip pain, which is why awareness of this condition matters.
Imaging for Stubborn or Suspicious Pain
When the clinical picture is not clear-cut, or when a doctor wants to confirm the exact location and size of a suspected growth before surgery, imaging comes into play. High-resolution ultrasound is a practical first step. It can show the tumor’s size, location, shape, and whether it is solid or cystic, though it has limitations in telling one type of tissue from another.10PubMed. Subungual tumors: clinicopathologic correlation with US and MR imaging findings Newer ultrasound devices operating at higher frequencies have pushed accuracy higher. One study comparing standard and high-frequency ultrasound found that 18-MHz ultrasound combined with color Doppler flow imaging detected blood flow signals in all tumors tested and significantly improved diagnostic accuracy over lower-frequency scans.11PubMed Central. Diagnosis of Subungual Glomus Tumors with 18 MHz Ultrasound and CDFI
MRI is the other main tool and is especially helpful for surgical planning. It gives a detailed picture of where the tumor sits relative to the nail bed, the bone, and the surrounding soft tissue. On MRI, glomus tumors typically light up brightly after contrast dye is injected, making them easy to spot even when they are just a few millimeters wide.12PubMed. Subungual glomus tumour: magnetic resonance imaging findings MRI can also help define the tumor’s exact borders before a surgeon goes in to remove it.13PubMed. Subungual glomus tumors: evaluation with MR imaging For straightforward cases where the clinical tests are clearly positive, some hand surgeons skip imaging and proceed directly to excision, but for atypical presentations or recurrences, MRI is the standard.
The Link Between Nail Pain and Inflammatory Disease
Not all pain under the fingernail traces back to a local problem. Certain systemic inflammatory conditions affect the nails from the inside out, and the pain they cause can be confusing because there may not be an obvious lump or injury to point to. Psoriatic arthritis is the best-studied example. The nail is physically anchored to the bone of the fingertip via a structure called the enthesis, and in psoriatic arthritis, these attachment points become inflamed. When the enthesis at the end joint of your finger is inflamed, the nail above it can become painful, pitted, thickened, or lifted off the nail bed.
Research using ultrasound to examine the fingertips of people with psoriasis has found a meaningful link between nail psoriasis and inflammation at the joint right beneath the nail. In one study, about two-thirds of patients with psoriasis had nail involvement, and more than a third had ultrasound-confirmed inflammation at that joint. Nail psoriasis was independently associated with this joint inflammation even after accounting for age, sex, disease duration, and whether the person already had psoriatic arthritis.14Pakistan Journal of Health Sciences. Frequency and Association of Distal Interphalangeal Joint Enthesitis with Nail Psoriasis in Patients with Psoriasis and Psoriatic Arthritis Presenting at a Tertiary Care Hospital in Karachi Another study found a moderate correlation between ultrasound-detected enthesitis at the fingertip joint and nail changes on ultrasound.15PubMed Central. The relationship between the nail and systemic enthesitis in psoriatic arthritis
This matters practically because if your nail pain is accompanied by other signs like pitting on the nail surface, oil-drop discoloration, crumbling of the nail edge, or joint stiffness in your fingers, those are clues that the problem is inflammatory rather than traumatic. Psoriatic nail disease often predates a formal psoriatic arthritis diagnosis by years, so nail pain in someone with psoriasis is worth mentioning to a doctor even if the joints feel fine at the moment.
Other inflammatory and autoimmune conditions can cause nail pain too, though less commonly. Lichen planus, a condition that causes purplish, flat-topped bumps on the skin and mucous membranes, occasionally involves the nails. When it does, it can cause thinning, ridging, and splitting of the nail plate, and a small percentage of patients report pain and difficulty handling objects.16PubMed Central. Clinical features and treatment outcomes of nail lichen planus: A retrospective study
What Happens After a Glomus Tumor Is Confirmed
The definitive treatment for a glomus tumor is surgical removal, and the results are usually excellent. The most common approach is a transungual excision, where the surgeon lifts or partially removes the nail plate to expose the tumor beneath it, then removes the growth. This method allows direct visualization of the nail bed and makes it easier to be sure the entire tumor has been taken out.17PubMed Central. Transungual surgical excision of subungual glomus tumour Most patients get complete pain relief after surgery. The nail usually regrows over the following months, though minor cosmetic irregularities in the nail can sometimes persist.
Recurrence is possible but not common. When it does happen, it is usually because a small fragment of the tumor was left behind, and a second surgery can address it. For people who have been living with months or years of unexplained fingertip pain, successful excision can feel almost surreal because the problem disappears so completely.
When to Get Your Nail Pain Checked
Mild, short-lived pain after stubbing or jamming a finger generally resolves on its own within days to a couple of weeks. You should consider seeing a doctor when the pain is persistent, when it wakes you up at night, when it gets dramatically worse in the cold, or when you notice changes in the nail’s appearance without a clear cause. A darkened streak running lengthwise down the nail deserves particular attention. Melanonychia, a brown-to-black discoloration of the nail plate, can be caused by benign processes like a mole in the nail matrix, but it can also signal a melanoma growing under the nail.18PubMed Central. Melanonychia – Clues for a Correct Diagnosis A widening, irregular, or darkening streak, especially on a single nail, warrants a dermatology evaluation.
Broadly, nail pain falls into four main categories: tumors, nail deformities, inflammatory or infectious diseases, and external or traumatic causes.3International Journal of Dermatology. Painful nails: A practical approach to the diagnosis and management of painful nail conditions Doctors who specialize in nail conditions sometimes use structured memory aids to run through the full list of possibilities, because the range of causes is wider than most people expect.19PubMed Central. Onychalgia Causes and Mechanisms: The “GIFTED KID” and the “FOMITE” The important thing from your side is to pay attention to the character of the pain and what makes it better or worse. Sharp, localized, cold-triggered pain points toward a glomus tumor. Throbbing pain with redness and swelling points toward infection. Diffuse aching with nail surface changes points toward an inflammatory condition. And pain that arrived right after an injury usually is exactly what it looks like: trauma. Knowing these patterns can help you describe your symptoms more precisely, which speeds up the diagnostic process considerably.
Simple Things You Can Do at Home
For pain that seems related to a recent minor injury and there is no sign of infection, basic care can go a long way. Keeping the finger clean and dry, avoiding pressure on it, and taking an over-the-counter anti-inflammatory can reduce the discomfort while the nail bed heals. If there is a visible dark collection of blood under the nail and the pressure feels unbearable, resist the temptation to puncture the nail yourself with a heated needle or pin. While the principle behind trephination (making a hole to release the blood) is straightforward, doing it at home without proper sterile technique risks introducing an infection into a confined space. A doctor or urgent care clinic can do it safely in minutes.
For chronic paronychia linked to wet work, the most effective home measure is keeping the hands dry. Wearing gloves during dishwashing or cleaning, drying hands thoroughly, and avoiding the habit of pushing back cuticles all help break the cycle of moisture, irritation, and bacterial or fungal colonization that keeps the infection smoldering. If the redness and tenderness persist for more than a couple of weeks despite these measures, prescription treatment is usually needed.
Pain that does not fit any obvious category, does not improve with time, or comes with unusual nail changes is not something to manage at home indefinitely. Glomus tumors in particular will never resolve on their own, and the sooner one is identified and removed, the sooner the pain disappears. The same applies to inflammatory conditions like psoriatic arthritis, where early treatment can prevent joint damage that accumulates over time if the disease goes unchecked.