The front part of the stool is black and hard, but the back part is normal, which is caused by the presence of constipation, constipation or dry stool. Normal people should keep a stool every day, if the excrement in the gastrointestinal can not be discharged on time, the water in the stool, it will be absorbed by the gastrointestinal mucosa second, resulting in the stool becomes dry and hard, can be regulated through diet. Every morning after waking up, you can promptly drink a glass of honey water or warm water, sufficient water can play a role in promoting gastrointestinal peristalsis, speeding up the digestion and absorption of the gastrointestinal. In the daily diet, be sure to focus on light. You can eat fruit half an hour after meals to speed up bowel movement, do not eat fried and spicy food to avoid fire, causing bowel difficulties, adhere to a period of light diet and drink more water. If the stool does not return to normal, do not rule out the existence of gastrointestinal bleeding, to go to the hospital in time to do a colonoscopy to confirm the diagnosis.