There are an estimated 30,000 mountain lions in the western United States. One mountain lion subspecies, the Florida panther, is critically endangered with a population of less than 100 individuals.
Causes of muscle twitching include: 1  Pregnancy. 2  Stress or anxiety. 3  Excessive caffeine. 4  Hypothyroidism. 5  Bug bites or stings. 6  Mono. 7  Parkinson's Disease. 8  Side-effects of certain drugs or medication (such as diuretics, corticosteroids, or estrogens).9  Dehydration.hese twitches often go unnoticed, and when you do feel them, they tend to feel worse and more noticeable than they actually are. Twitches, also known as fasciculations, can occur in the arms, feet, fingers, hands, head, legs, stomach, and other parts of the body.
Diseases That Cause Muscle Twitches. Doctor and patient speaking to each other. Muscle twitches are brief, painless, involuntary movements of parts of muscles. Some are visible under the skin, others are just felt. Disorders affecting any part of the nervous system that controls movement, or the muscles themselves, can result in muscle twitches. While some of these are serious and even life-threatening, it is important to note that common, harmless conditions may also cause muscle twitches.