However, this appears to depend on the type of headache.
One study of 18 people found that water had no effect on the frequency of headaches, but did reduce the intensity and duration somewhat (17Trusted Source).
BOTTOM LINE:Drinking water can sometimes help relieve headache symptoms, especially in people who are dehydrated.
Constipation is a common problem, characterized by infrequent bowel movements and difficulty passing stool.
Increasing fluid intake is often recommended as a part of the treatment protocol, and there is some evidence to back this up.
BOTTOM LINE:Drinking plenty of water can help prevent and relieve constipation, especially in people who generally do not drink enough water.
Urinary stones are painful clumps of mineral crystal that form in the urinary system.
The most common form is kidney stones, which form in the kidneys.
Higher fluid intake increases the volume of urine passing through the kidneys, which dilutes the concentration of minerals, so they are less likely to crystallize and form clumps.
Water may also help prevent the initial formation of stones, but studies are required to confirm this.
BOTTOM LINE:Increased water intake appears to decrease the risk of kidney stone formation. More research is needed in this area.
A hangover refers to the unpleasant symptoms experienced after drinking alcohol.
Although dehydration is not the main cause of hangovers, it can cause symptoms like thirst, fatigue, headache and dry mouth.
A good way to reduce hangovers is to drink a glass of water between drinks, and to have at least one big glass of water before going to bed.
BOTTOM LINE:Hangovers are partly caused by dehydration, and drinking water can help reduce some of the main symptoms of hangovers.
Drinking plenty of water can help you lose weight.
This is due to the fact that water can increase satiety and boost your metabolic rate.
This means that drinking 2 liters of water every day can increase your total energy expenditure by up to 96 calories per day.
In one study, dieters who drank half a liter of water before meals lost 44% more weight, over a period of 12 weeks (30Trusted Source).
It is actually best to drink water cold, because then the body will use additional energy (calories) to heat the water to body temperature.