The arm hangs from the shoulder and is controlled by nerves from the neck, which is why most arm pain originates outside the arm. Pain on the outside of the upper arm, a hand's width below the shoulder, where it feels as if the muscle aches when you lift the arm or lie on your side, is almost always the shoulder tendons: impingement or tendinopathy in the rotator cuff, the bursa under the acromion, or a frozen shoulder on its way. Pain on the front of the upper arm along the biceps, painful to lift with the palm up, is often the long biceps tendon. Pain that starts in the neck or shoulder blade and goes down the arm like an electric string, with tingling and numbness in specific fingers, is a nerve root pinched by a disc herniation or a narrowing in the neck. Forearm pain at the elbow is tennis or golfer's elbow, further down mouse arm, and in the wrist and hand carpal tunnel. And then the muscular pain that actually is the arm: sore, overworked biceps, triceps and deltoid after unaccustomed training, moving house or a day with the chainsaw, which heals in a few days to a week. What must never be missed is that pain in the left arm (sometimes both) together with chest pressure, breathlessness, cold sweat or nausea can be the heart, and that a swollen, heavy, blue-red arm can be a blood clot. Here is the arm part by part, the warning signs, and what helps.
Call emergency services or seek care the same day
- Emergency services: pain or heaviness in the left arm (sometimes right or both) together with pressure, heaviness or pain in the chest, breathlessness, cold sweat, nausea or dizziness, especially on exertion or at rest without having loaded the arm; sudden weakness or numbness in one arm together with a drooping mouth, speech difficulty or visual disturbance (stroke); an arm that suddenly becomes cold, pale and painful without a pulse.
- Same day: an arm that over hours to a day has become swollen, heavy, warm or blue-red, often with visible veins on the chest or upper arm (blood clot in the arm, most common after heavy training with the arms overhead, a cannula/port or in young athletes); arm pain after a fall or blow with misalignment, marked swelling or inability to move; sudden severe pain and weakness with a snap during a lift (tendon rupture, biceps or rotator cuff); increasing weakness or numbness in the hand over a few days; a red, warm, swollen joint with fever.
Where in the arm does it hurt, and what it usually means
| Location and character | Most common | How it feels | Read more |
|---|---|---|---|
| Outside of the upper arm, a hand's width below the shoulder, ache referring from the shoulder | Shoulder tendons: impingement, rotator cuff tendinopathy, bursa | Painful to lift the arm sideways and overhead, put on a jacket, reach behind the back, lie on the side; ache referring down towards the elbow but not below; no numbness | Shoulder impingement, shoulder exercises |
| Whole shoulder and upper arm, stiff, can't lift or rotate the arm | Frozen shoulder | Increasing stiffness over weeks to months, severe night pain, usually 40–60, often women and diabetics | Frozen shoulder |
| Front of the upper arm, along the biceps up towards the front of the shoulder | Biceps tendinopathy | Tender in the groove at the front of the shoulder, painful to lift with the palm up, carry bags, screw; a sudden snap and a "Popeye bulge" is a rupture | Arm exercises |
| Back of the upper arm, triceps | Overload, trigger points | Tender in the muscle after dips, push-ups, throwing; sometimes refers down towards the back of the elbow | Muscle knots |
| From the neck or shoulder blade down the arm, electric, burning, with tingling and numbness in certain fingers | Nerve root involvement from the neck (cervical radiculopathy) | Worse when you bend the head back or to that side, better with the hand on the head; thumb and index finger (C6), middle finger (C7) or little finger (C8) go numb; sometimes weakness | Neck pain, herniated disc, nerve pain |
| Whole arm heavy, numb, tired, especially with the arms up or carrying a bag on the shoulder | Thoracic outlet syndrome (compression between collarbone, first rib and neck muscles) | Numbness on the inside of the arm and in the ring and little finger, the arm falls asleep when hanging washing, coldness and pallor in the hand | Posture, neck and chest muscle stretching, physiotherapist |
| Outside or inside of the elbow, down into the forearm | Tennis elbow, golfer's elbow, mouse arm | Tender on the bony bump at the elbow, painful to grip, lift the coffee cup, shake hands, type | Tennis elbow and mouse arm, elbow pain |
| Wrist, hand and fingers, numbness at night | Carpal tunnel syndrome | Thumb, index and middle finger go numb, you wake and shake the hand, drop things | Carpal tunnel syndrome, wrist pain |
| Sore muscles in the whole arm after exertion | Muscle soreness, overload | Comes 1–2 days after, tender to press and use, passes in a few days | Muscle soreness |
| Upper arm after vaccination | Local reaction in the deltoid | Tender, sometimes swollen and red, painful to lift the arm for a few days; rarely a longer shoulder pain from an injection placed too high (SIRVA) | Movement, heat; your doctor if shoulder pain lasts more than a couple of weeks |
| Swollen, heavy, blue-red arm | Blood clot in the arm | See above: same day | – |
When arm pain is the heart
The heart lacks its own pain nerves in the usual sense and borrows the pathways of the neck and arm, so oxygen shortage in the heart muscle is often felt in the left arm, sometimes both, in the jaw or between the shoulder blades. The difference from muscle and nerve pain: heart pain in the arm isn't affected by moving the arm, pressing on it or changing position; it comes with exertion, stress or at rest and doesn't let go within a few minutes; and it rarely comes alone but with pressure or discomfort in the chest, breathlessness, cold sweat or nausea. Women, older people and diabetics more often have arm ache, fatigue and nausea than classic chest pain. If unsure: emergency services, not your doctor tomorrow. More in chest muscle pain or the heart.
Your doctor within one to two weeks
- Pain radiating from the neck down the arm with numbness or tingling not improved in two weeks, or with weakness (difficulty lifting the arm, gripping, straightening the fingers).
- Shoulder or upper arm pain not improved in four to six weeks with offloading and exercises, or where you can't lift the arm.
- Night pain in the shoulder and upper arm that wakes you several nights a week.
- Numbness that is there all the time, dropped objects, clumsiness.
- Arm pain with swelling in a joint, fever, weight loss or previous cancer.
- Recurrent arm pain on exertion that releases at rest (investigate the heart).
What helps
1. Offload the right thing, not the whole arm
With shoulder tendons: avoid repeated lifts above shoulder height and lying on that side for a couple of weeks, but keep the arm moving below shoulder height. With nerve involvement from the neck: avoid positions that increase the arm pain (head back, long spells with the head turned) and place the hand on the head when it radiates, which gives the nerve slack. With muscular overload: light movement and heat, back to loading within a few days. Total rest almost always makes the arm stiffer and weaker.
2. Exercises for the shoulder
External rotation with a resistance band (elbow at the side, 3 × 15), internal rotation, rows with a band, shoulder blade squeezes, pendulum movements, wall walks with the fingers, and side raises to 45 degrees with the thumb up; daily for six to twelve weeks. The programme with pictures is in shoulder exercises: strength and mobility and shoulder impingement.
3. Exercises for the neck, with nerve involvement
Chin tucks, gentle rotation and side bending towards the side that doesn't increase the arm pain, shoulder blade strength, and nerve gliding: stretch the arm out to the side with the palm forward, tilt the head to the opposite side, then bend the head back as you bend the elbow, 10 slow times. See neck exercises; a physiotherapist sets the plan with clear nerve involvement.
4. Workstation and habits
Screen at eye level, forearms resting, mouse close to the body, breaks every half hour with shoulder rolls and arm stretches; bag in the hand or on the back instead of on the shoulder; phone in the hand, not in the crook of the arm. See cupping for people who sit a lot.
5. Heat and temporary relief
Heat on shoulder and neck for 15 minutes before exercises; cold on an acutely overworked muscle or tendon in the first days if it has swollen. Over-the-counter anti-inflammatories for a few days with acute tendon irritation can let you start exercising.
6. Cupping the shoulder, upper arm and forearm
Cupping suits the arm well because it is the superficial muscle groups, deltoid, biceps, triceps, forearm extensors and flexors, and the shoulder's surroundings, trapezius, infraspinatus on the shoulder blade and the chest muscle, that most often carry the tension and trigger points. The suction releases them, increases blood flow to tendon attachments with poor circulation and reduces the ache, so the exercises go more easily. How to: oil the skin, glide the mini cup with light suction from the elbow up along the outside of the upper arm over the deltoid towards the shoulder, 2 minutes, along the biceps and triceps, one minute each, and along the top and underside of the forearm from the wrist towards the elbow, one minute per side; use the dynamic cup over the shoulder blade, upper trapezius and the edge of the chest muscle, 2–3 minutes. Place static cups on the infraspinatus in the middle of the shoulder blade and on the deltoid, 5 minutes, while you slowly swing the arm. Finish with external rotations and neck stretches. Don't cup in the crook of the elbow or the armpit, not over a suddenly swollen arm (blood clot), not with suspected tendon rupture or fracture, not on skin with rash or wounds, not with nerve involvement with weakness that hasn't been investigated, not on an arm with lymphoedema after breast cancer treatment without the lymph therapist's OK, and not if you take blood thinners without having asked; see when to avoid cupping. Programmes: the cupping programme for arm and shoulder and the programme for hands and forearms.
Deeper guides
Shoulder impingement, frozen shoulder, neck pain, tennis elbow and mouse arm, elbow pain, wrist pain, numbness in the hands and arm exercises at home.
Frequently asked questions
Why does my upper arm hurt?
Most often the pain comes from the shoulder: impingement or irritated rotator cuff tendons refer down the outside of the upper arm and hurt when you lift the arm or lie on your side. Pain along the front is often the biceps tendon; at the back the triceps. Pain starting in the neck and going down the arm with tingling and numbness in certain fingers is a pinched nerve. Soreness in the whole muscle after exertion is overload and passes in days.
When is pain in the left arm the heart?
When the pain or heaviness in the arm isn't affected by moving the arm or pressing on it, comes with exertion, stress or at rest without the arm having been loaded, doesn't let go within a few minutes, and comes with chest pressure, breathlessness, cold sweat, nausea or dizziness. Women, older people and diabetics more often have arm ache and fatigue than classic chest pain. If in doubt: call emergency services.
Why does my arm go numb?
Numbness follows nerves: thumb and index finger suggest nerve root C6 in the neck, middle finger C7, little finger C8 or the ulnar nerve at the elbow; thumb, index and middle finger at night suggest carpal tunnel syndrome; the whole arm heavy and numb with the arms up suggests thoracic outlet syndrome. Temporary numbness that releases when you change position is pressure on the nerve; numbness that persists, with weakness or clumsiness, should be assessed by a doctor.
What helps arm pain?
Offload what provokes it (lifts above shoulder height with shoulder tendons, head back with nerve involvement) but keep the arm moving, heat before exercises, daily shoulder and neck exercises for six to twelve weeks, screen at eye level and breaks, and cupping of shoulder, upper arm and forearm that releases muscles and trigger points. Arm pain with numbness over two weeks, weakness or night pain should be assessed by your doctor.
Does cupping help arm pain?
Yes, when the pain comes from muscles, tendon attachments and trigger points in shoulder, upper arm and forearm: cupping releases the deltoid, biceps, triceps and forearm muscles, the infraspinatus on the shoulder blade and the edge of the chest muscle, increases blood flow to the tendons and makes the exercises easier. Not in the crook of the elbow or armpit, not on a suddenly swollen arm, with suspected rupture or fracture, uninvestigated nerve weakness, lymphoedema in the arm without the lymph therapist's OK, or with blood thinners without a doctor's OK.
Related guides
Written by Curam. Last updated 17 October 2026. This is general self-care information and does not replace medical care. For sudden, severe or unusual symptoms, contact your doctor. Talk to your doctor before cupping if you are pregnant, take blood thinners or have a condition affecting skin, blood vessels or blood.
