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You have not mentioned your age. Blood in stool
can be due to Anal fissure
, Haemorrhoids among few of the causes. Since you are having burning pain it is best you consult Surgeon who will examine you for any small swellings in the anus or any anal tear (fissure) which can occur due to constipation
and bad eating habits. You need to prevent constipation by eating food rich in fresh fruits and vegetables and fibre like oats, wheat. You can try Ispaghulla husk 2tsp in one glass warm water to relieve from constipation for more than 2 days. You can sit is warm water shallow bucket for pain relief. Avoid eating spicy, fatty food. Drink plenty of water. Doctor will give you anaesthetic gel to remove pain if indicated. Better go to a Doctor and get examined and you can be treated as soon as possible and relieve you of your misery.