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.
Most commonly, the cramps are caused by the bodyâs shortage of minerals, such as calcium and magnesium. A shortage of acetic acid can also cause cramps. The body uses acetic acid to produce acetylcholine, which is essential for leg muscle contractions. This is why mustard is effective for leg cramp relief.