What should you know about sudden muscle cramps?

A cramp often starts during exercise, after prolonged standing, or at night and commonly affects the calf, foot, thigh, or hand. Sweating, vomiting, diarrhoea, or inadequate fluid intake can contribute to dehydration. A muscle strain can trigger protective tightening. Recurrent cramps may occur with peripheral arterial disease, hypothyroidism, chronic kidney disease, vitamin D deficiency, or age-related loss of muscle known as sarcopenia. A clinician may also review your medicines and circulation, especially if cramps occur with walking and ease with rest.

Stop the activity and gently lengthen the affected muscle. For a calf cramp, straighten the leg and draw the toes towards you, or stand carefully and place weight on the leg if safe. Massage the area lightly and use warmth after the muscle relaxes. Sip fluids after sweating or illness; do not take salt or electrolyte products routinely without advice. Resume activity gradually, with a warm-up and regular breaks. Keep a note of the muscle involved, time of day, triggers, duration, and any swelling or weakness.

Get urgent help if a cramp comes with a cold, pale, or blue limb, severe swelling, chest symptoms, fainting, new weakness, or loss of movement. Arrange prompt advice when cramps are frequent, last unusually long, follow a new medicine, or occur with reduced urine, persistent vomiting, or significant weakness. Book a routine appointment for cramps that disturb sleep, limit walking, or continue despite sensible stretching and fluids.

Could my medicines, circulation, thyroid, kidneys, or vitamin levels be contributing? Do I need blood tests? Which stretches and fluids are suitable for me? How should I respond if cramps recur at night?