Reliable indicator of dehydration is a rapid decline in weight. During some days the person can lose up to several kilograms. Rapid weight loss, more than 10% of the total weight is considered heavy.

Dehydration symptoms are difficult to distinguish from symptoms of other diseases, but, in general, mild dehydration has the following early warning signs and symptoms:

• High thirst.
• Dry mouth and adhesive saliva.
• Reduced urination, when the urine color becomes dark yellow.
• Fatigue.

Secondary dehydration symptoms include:

• Extreme thirst.
• Dryness of the mouth; crying without tears.
• Reduced urination, or half of the normal urination amount for 24 hours (usually 3 or fewer urination). The urine is dark yellow or brown color.
• Slight dizziness.
• Legs and hands are cold.
• Hurried hear beating.
• Loss of appetite.

Severe dehydration symptoms may be presented by (even if you noticed only one of pointed below):

• Changes in behavior, such as a heightened sense of fear, embarrassment, inattention.
• Dizziness, which did not pass if you put the person on a bed.
• Inability to stand or walk.
• Hurried breath.
• Weak, rapid pulse.
• Cold and adhesive skin, or hot and dry skin.
• Slight urination within 12 hours or longer.
• The loss of consciousness.

By the time of severe dehydration there are no enough fluid to bring the blood to vital organs in human body. Severe dehydration should be treated in hospital. If you noticed any severe dehydration symptoms, immediately call an ambulance or other medical service.

Ask your doctor if you have the following dehydration symptoms:

• Intensive or continuous vomiting throughout the day;
• high fever;
• diarrhea more than 2 days;
• weight loss;
• reduced urination;
• stupefaction;
• weakness.

Take the patient into the hospital, if it has:

• High temperatures above 39 ° C;
• Retardation;
• Headache;
• Seizures;
• Trouble breathing;
• Chest pain;
• Urine absences within 12 hours.