Lower back muscle cramp: what to know

A cramp can follow overuse, an awkward movement, prolonged sitting or a muscle strain. Sweating, vomiting or diarrhoea can contribute to dehydration, while some medicines and health conditions can affect fluid or mineral balance. Repeated cramps may warrant a review for conditions such as Dehydration, Muscle Strain, Hypothyroidism, Chronic Kidney Disease or Vitamin D Deficiency. A cramp is a symptom, not a diagnosis.

Stop the activity and breathe slowly. Change position gradually, then try a gentle back stretch or a short, easy walk if movement does not worsen the pain. A warm shower or heat pack wrapped in cloth may relax the area. Drink fluids when you can, particularly after sweating, but do not force fluids if a clinician has restricted them. Avoid forceful massage, sudden lifting and intense exercise until the spasm settles. Note what you were doing, how long it lasted and whether it returns.

Seek urgent medical help for new loss of bladder or bowel control, numbness around the groin, severe weakness in a leg, fainting, fever with marked back pain, or pain after a serious injury. Arrange a medical assessment when cramps are recurrent, persist despite rest, disturb sleep, or occur with leg swelling, colour change or pain when walking. Peripheral Arterial Disease and Sarcopenia are among the issues a clinician may consider alongside everyday muscle causes.

Could a medicine, dehydration or another condition be contributing? Which stretches and activities are suitable for me? Do I need an examination or blood tests because the cramps keep returning?