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.
Common Causes of Shaking of the Legs or Leg Tremors. 1  Diseases which affect the central nervous system, e.g. Parkinson's disease. 2  Damage to the nerves. 3  Certain medications such as asthma drugs, lithium, certain antidepressants and anti-seizure drugs may cause tremors.