Certain medications, overactive thyroid, brain disorders and excessive alcohol consumption are causes of hand trembling. Other causes include stress, excessive caffeine intake, muscle weakness and stroke, according to MedlinePlus.
A tremor is a type of shaking movement that is often noticed in the hands and arms, but can affect all parts of the body. Essential tremors are the most common hand tremors and involve small, rapid movements, claims MedlinePlus.
Hand tremors are usually mild but depending on the underlying cause, they are treated using medications such as beta blockers, tranquilizers and anti-seizure drugs, botox injections and brain stimulation surgery, according to Healthline.