Muscle cramps causes: what to know

A cramp is an involuntary tightening that may follow strenuous activity, a new exercise routine, prolonged sitting, or heavy sweating. Dehydration can make cramps more likely. Repeated cramps may also occur with muscle strain, reduced muscle mass, peripheral arterial disease, hypothyroidism, kidney disease, or vitamin D deficiency. These conditions are possible contributors, not conclusions from the symptom alone. The location, timing, duration, medicines, and associated weakness or numbness help narrow the possibilities.

During an episode, stop the activity and gently stretch or massage the muscle. Rehydrate gradually when safe, especially after sweating, vomiting, or diarrhoea. Keep a diary of triggers and review prescription medicines with a clinician. Do not begin mineral or vitamin supplements without advice, because the wrong product can be harmful in some health conditions.

Arrange an assessment when cramps recur without a clear trigger, affect several areas, disturb sleep, or limit walking or daily tasks. Seek urgent help for sudden weakness, loss of sensation, fainting, confusion, severe breathing difficulty, or a painful swollen limb.

Ask which causes match your pattern, whether your medicines or health history contribute, and whether an examination or blood tests would be useful. Share your diary and all supplements.