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60 years
My father have diarrhea for almost a month ago ,but everything is ok ,no fever,no belly pain ,no vomit , apettite is good too ,what it could ?BTW,he is on hypertension medicine and cholesterol
May 8, 2014

Dr. Rania Mousa General Medicine
Some cases of diarrhea require medical attention. Diarrhea can quickly deplete the body's supply of water and electrolytes (such as sodium and potassium) that tissues need to function. People who are very young, old, or sick may have difficulty replacing lost fluids. Also, when diarrhea lasts for several weeks or contains blood, a serious illness may be the cause. In these cases, you should contact your doctor immediately
The most common cause of diarrhea is a virus that infects the gut. The infection usually lasts for two days and is sometimes called "intestinal flu" or "stomach flu."
Since your father diarrhea is not related with any other symptom and the condition is good then it might be a part of IBS syndrome ,or an influence of the medication taken but if it lasts longer then he must check with a doctor to make further tests and know the cause to treat .
Diarrhea may also be caused by:

Infection by bacteria (the cause of most types of food poisoning)
Infections by other organisms
Eating foods that upset the digestive system
Allergies to certain foods
Radiation therapy
Diseases of the intestines (Crohn's disease, ulcerative colitis)
Malabsorption (where the body is unable to adequately absorb certain nutrients from the diet)
Some cancers
Laxative abuse
Alcohol abuse
Digestive tract surgery
Competitive running
Diarrhea may also follow constipation, especially for people who have irritable bowel syndrome.