If the brain's blood supply is decreased too much, the person may pass out (syncope). Symptoms may worsen when changing position from lying down or sitting, to standing up. In addition to feeling dizzy, associated symptoms may include: 1  Sweating. 2  Weakness. 3  Nausea and vomiting. 4  Shortness of breath. 5  Chest pain.
Although most muscle cramps are harmless, some may be related to an underlying medical condition, such as: 1  Inadequate blood supply. Narrowing of the arteries that deliver blood to your legs (arteriosclerosis of the extremities) can produce cramp-like pain in your legs and feet while you're exercising. 2  Nerve compression.
It can be due to a cramp, injury, or other cause. Leg pain can be due to a muscle cramp (also called a charley horse). Common causes of cramps include: 1  Dehydration or low amounts of potassium, sodium, calcium, or magnesium in the blood.  Medicines (such as diuretics and statins)