Muscle spasm and cramp: why muscles seize up
Why muscles suddenly tighten into spasm or cramp, what tends to contribute, general self-care and when to speak to your GP.
A muscle spasm or cramp is a sudden, involuntary tightening of a muscle that can be intensely painful. It often passes within seconds or minutes, but the muscle may stay sore for a day or so. Cramp is common during or after exercise and at night, and spasm often shows up around a painful back or neck.
When to get urgent help
Go to A&E or call 999 if you have any of these. They can be signs of a fracture, infection, blood clot or other emergency.
- A limb that looks deformed, or a joint that you cannot move or put weight on after an injury
- A cold, pale or numb foot or hand after injury
- A hot, red, swollen joint with a high temperature
- A painful, swollen, warm calf, with or without breathlessness or chest pain
What it can feel like
- A sudden hard, tight muscle that you cannot easily relax
- A visible or palpable lump in the muscle during a cramp
- Soreness for hours or a day afterwards
- Spasm in the muscles beside the spine when the back or neck is painful
Common contributors
- Overexertion or fatigue, particularly in hot conditions
- Sitting or lying in one position for a long time
- A protective response from the body when a nearby joint or tissue is sore
- Some medicines and medical conditions, which is why frequent cramps are worth mentioning to a GP
General self-care
These are general comfort measures many people find reasonable. They are not a treatment plan, and what suits one person may not suit another.
- Gently stretch and walk the muscle out when a cramp starts
- Warmth, such as a warm bath or heat pack, can help the muscle relax
- Gentle massage of the affected muscle can feel soothing
- Keep drinking water regularly, particularly around exercise and hot weather
- Warm up before exercise and build up activity gradually
When to see your GP
See your GP promptly, or call NHS 111, if you have any of the following:
- Pain after a significant injury, fall or twist
- Pain that is constant, severe or getting worse, or wakes you at night
- Unexplained weight loss, fever or feeling generally unwell with limb pain
Consider seeing your GP if:
- Cramps that are frequent, severe or keep waking you at night
- Cramps alongside weakness, numbness or muscle wasting
- A painful, swollen, red or warm calf, particularly if only one leg is affected. This needs same-day medical assessment
How osteopathy may help
Osteopaths regularly see people with muscle spasm and cramp. After taking a full history and examining you, treatment typically combines hands-on techniques (such as soft-tissue work, joint mobilisation and, where suitable, manipulation) with advice and exercises you can do yourself. For some people this may help ease pain and stiffness and make movement more comfortable.
For muscle spasm that comes with back or neck pain, soft-tissue techniques are commonly used as part of the package described in the back pain guide. Research on hands-on treatment specifically for night cramps is limited, and many cramps have no clear cause.
Results vary from person to person, some people feel a little sore for a day or two afterwards, and osteopathic care is not right for everyone. It sits alongside, not instead of, medical care, and staying active and doing your exercises remain central.
If you would like your symptoms assessed, you are welcome to book an appointment. Osteopathic care is not right for everyone, and if something needs medical attention first, I will tell you.
Common questions
Why do I get leg cramps at night?
The NHS lists ageing, strenuous exercise (worse in hot weather), later pregnancy, some medicines such as statins and diuretics, and dehydration as causes, and in some cases no cause is found. See your GP if cramps disturb your sleep, come with numbness or swelling in the legs, or last longer than 10 minutes.
Do calf stretches stop cramp?
The NHS says regular calf stretches may reduce cramps, though they may not stop them entirely. During a cramp, stretching and massage may ease the pain, and standing and putting weight on the leg may help.
Is a painful calf always a muscle strain or cramp?
No. A painful, swollen, warm or red calf, especially on one side, can be a blood clot (DVT) and needs same-day medical assessment. Call 999 if you also have breathlessness or chest pain.
Sources and further reading
Links open in a new tab. Sources were checked in October 2026.
Related guides
This page is general information to help you understand common aches and pains. It is not medical advice and cannot diagnose your problem. If you are worried about your symptoms, please speak to your GP or call NHS 111.