In the past, taxpayers weren't required to pay Medicare tax on income generated from investments such as capital gains, dividends, and taxable interest. Since 2013, however, you could owe a 3.8% Medicare tax on some or all of your net investment income (as part of the Affordable Care Act).
Restless legs syndrome (RLS) is a neurological disorder characterized by uncomfortable leg sensations that can interfere with resting or falling asleep. Experts believe that low levels of iron in the brain may be responsible for RLS. An imbalance of dopamine is also believed to be involved.
Among the common causes of leg tremors are diseases that affect the central nervous system, such as Parkinson's disease. In some cases, a person may cause damage to his nerves that leads trembling. For example, a heavy drinker may suffer nerve damage that causes him to experience tremors.