Tendonitis typically feels like a dull ache centered around a joint or limb, especially when you move it. The pain often comes with tenderness to the touch, mild swelling, and a sense of stiffness that can be worst first thing in the morning. But the specific sensations vary depending on where the tendonitis is, how long you’ve had it, and what triggered it.
The Core Sensations
The hallmark of tendonitis is a dull, achy pain that flares with movement and settles with rest, at least early on. You’ll likely notice tenderness when you press on or near the affected tendon, and the area may look slightly swollen, feel warm, or appear reddened. Some people also hear or feel a crackling or popping sensation when they move the joint, which comes from roughened tendon tissue sliding through its surrounding sheath.
Stiffness is another common feature, particularly after you’ve been sitting or sleeping. Many people describe a “warm-up” pattern: the joint feels tight and uncomfortable when you first start moving, loosens up with gentle activity, then aches again after sustained or intense use. This cycle of stiffness, relief, and returning pain is one of the more recognizable signatures of the condition.
How It Feels in Specific Locations
Achilles Tendon (Back of the Heel)
Achilles tendonitis usually starts as a mild ache in the back of the leg or just above the heel after running or other activity. As it worsens, the pain can shift from a dull ache to a more intense burning sensation, particularly after longer runs, stair climbing, or sprinting. The area tends to be stiff in the morning, and that stiffness usually eases with light movement. In more advanced cases, the pain lingers even at rest.
Shoulder (Rotator Cuff)
Shoulder tendonitis produces a dull ache deep in the shoulder that often gets worse at night. Sleeping on the affected side can be particularly painful. You might notice it most when reaching overhead, combing your hair, or trying to reach behind your back. The pain isn’t always sharp during the day, but it can become a persistent, nagging discomfort that disrupts sleep more than daily tasks.
Elbow (Tennis Elbow)
Tennis elbow, or lateral epicondylitis, has a distinctive feel. The pain is often sharp or burning and sits on the outer side of the elbow. What makes it especially noticeable is how it shows up during grip-dependent tasks: turning a doorknob, opening a jar, shaking someone’s hand, or even holding a pen. Your grip may feel noticeably weaker during these motions, even when you’re not applying much force. The pain can spread from the elbow down into the forearm and wrist, and it often intensifies at night or when you twist or bend your arm.
Acute Tendonitis vs. Chronic Tendon Pain
Fresh tendonitis, where the tendon is actively inflamed, tends to produce swelling, tightness, and a dull ache that worsens with movement but improves with rest. The area is usually tender to the touch, and the pain is relatively predictable: use the tendon, feel the ache.
Chronic tendon pain (sometimes called tendinosis) feels different. The inflammation has largely resolved, but the tendon tissue itself has started to degenerate. People with tendinosis often describe more of a burning sensation, decreased range of motion, and pain that shows up after activity rather than during it. You might also notice a firm, tender lump in the affected area, which is thickened or damaged tendon tissue. This distinction matters because the treatment approach for chronic tendon degeneration differs from what works for acute inflammation.
Pain Patterns Throughout the Day
Tendonitis follows a fairly predictable daily rhythm. Mornings are usually the worst. After hours of stillness during sleep, the tendon and surrounding tissue stiffen, and the first few minutes of movement can feel uncomfortable or outright painful. Gentle activity gradually loosens things up, and many people feel their best during the middle part of the day with moderate movement.
The pain typically returns or worsens after periods of heavy use, or paradoxically, after sitting still for a long stretch in the afternoon. If you’ve pushed through a workout or a physically demanding task, you’ll likely feel it most in the hours afterward rather than during the activity itself. As tendonitis progresses without treatment, this pattern can compress: the pain-free window shrinks, and eventually discomfort may be present even at rest.
What Tendonitis Does Not Feel Like
Tendonitis pain is localized. It centers on a specific tendon and the joint it crosses. If your pain is diffuse, spread across a large area, or comes with numbness and tingling, something else may be going on, such as nerve compression or joint disease.
One sensation that should get your immediate attention: a sudden pop or snap followed by sharp pain and an inability to use the limb normally. This can signal a tendon rupture rather than tendonitis. With an Achilles rupture, for example, people often hear a distinct popping sound, feel immediate sharp pain in the back of the ankle, and find they can’t push off with that foot or stand on their toes. A rupture is a medical emergency. Tendonitis builds gradually; a rupture announces itself all at once.
How Tendonitis Is Identified
Doctors diagnose tendonitis primarily based on what you describe feeling and a hands-on physical exam. For shoulder tendonitis, this often involves moving your arm into specific positions that narrow the space around the tendon, reproducing the pain you’ve been experiencing. For Achilles tendonitis, the key findings are pain or swelling along the tendon, pain that increases with exercise or stair climbing, and discomfort when wearing certain shoes. Imaging like ultrasound or MRI is sometimes used to assess how much damage exists within the tendon, but your reported symptoms are usually enough to confirm the diagnosis.