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.
Fasciculation (Muscle Twitch). Fasciculation, or muscle twitching, is involuntary movement of the muscles in an area of your body. Common areas for spasms or tremors to occur include the eyelid, calf or thumb. Muscle spasm causes range from stress to neurological problems.ertain drugs, such as diuretics, corticosteroids or estrogens may have also cause muscle twitching as a side effect. Because the most common causes of muscle twitching are stress or strenuous exercise, you may experience occasional muscle fasciculation if you are an athlete.