Next morning after a night of drinking excess of alcohol your head is hammering and whole body is paining. You feel dryness of mouth and you are dehydrated. When you try to move to a relaxed pose, it only hurts more. In worse cases, when you move your body, you find out that you are shaky and disgusted. You feel room is revolving and you try to put your foot on the ground to make it stop. It doesn't work. This is what exactly called hangover. The term hangover means collection of horrible and painful symptoms that can develop after drinking excess of alcohol. Those signs can range from normal uneasiness to the severe headache and uneasiness.
There is no measured quantity of alcohol that will cause a hangover, since every person reacts to alcohol in a different way, but in general, the more you had to drink, the more harsh the hangover symptoms. Physical symptoms of a hangover are headache, weakness, increased sensitivity toward sound and light, muscle pain, redness of the eyes, hunger and dryness. Signs of increased sympathetic nervous system action can escort a hangover, including increased systolic blood pressure, speedy heartbeat, shiver, and sweating. Mental signs include lightheadedness; feel of room; and possible cognitive and mood instability, especially depression, nervousness, and irritability.