A possible cause of sudden muscle weakness in one or both legs is stroke, which is a potentially fatal condition that reduces oxygen supply to the brain, states Healthgrades. Other potential causes of leg weakness includ... More »

Individuals who experience repeated episodes of sudden leg weakness should seek prompt medical attention, states Healthgrades. There are many causes of leg weakness, from general fatigue to life-threatening conditions su... More »

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Symptoms that sometimes accompany leg weakness include a prickling feeling, paralysis, numbness, muscle spasms or a burning sensation, reports Healthgrades. Some people with leg weakness also experience a twitching, red,... More »

Sudden nosebleeds can be caused by dry air, an underlying health condition, such as allergies, liver disease, kidney disease or a heart condition, such as hypertension or congestive heart failure. Additionally, a sudden ... More »

www.reference.com Health Pain & Symptoms

Potential causes of sudden muscle contractions while sleeping include sleep myoclonus, a condition that produces brief twitching of the muscles, and restless leg syndrome, according to the American Sleep Association. Mus... More »

www.reference.com Health Pain & Symptoms

Fetal positioning in the uterus is a possible cause of overlapping toes, and the condition is likely inherited, according to Foot Vitals. As of 2015, doctors are not certain of the cause of overlapping toes, but the cond... More »

www.reference.com Health Pain & Symptoms

The specific cause of essential tremors is not yet known, but the condition is linked to irregular electrical activity in the brain. Genetic mutation is believed to cause essential tremors in about half of the cases. Thi... More »

www.reference.com Health Pain & Symptoms