### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
I have had really bad stomache pain for about 4 months now and it keeps getting worse. It makes me nausous and it feels like a knife cutting the inside of my stomach. I have recently started to have bright red blood in my stool. I dont know whats wrong with me and i have been to two different doctors and had so many blood test done. Please help.

### output:

Hi. Thanks for your query.4 months is a long time to suffer from pain in abdomen. You have nausea, feels like knife cutting in the stomach, bright red blood in stool, consulted 2 Doctors and have undergone many blood tests. The most probable reasons for your symptoms are:Acid Peptic Disease, causing stomach ulcer or duodenal ulcers, can be a cancer too. Your another problem of fresh blood in the stool can be due to Hemorrhoids. I would advise you the following:-Upper GI Endoscopy to see for ulcers / cancer and so.-Colonoscopy to see for the fresh blood in the stool and to know the reasons like piles, cancer, mass, polyp and so on. If required biopsy will be done.-CT scan of the abdomen.-Examination of the stool and urine as you have already undergone many blood tests, which may be normal as you have not mentioned anything here. The further treatment will be as per the reports; till then get started on:PPI like Pantoprazole Antacid liquid at 3 hourly intervals. Soft bland diet and small frequent food. Avoid all the foods and beverages that instigate or enhance the problems. Laxatives if the stools are hard. Sitz bath in a tub with warm water. 5-day course of an antibiotic and metronidazole, probiotics, symptomatic and supportive., If all the investigations are normal, you may have to undergo MRI of the spine as there's a possibility of prolapsed inter-vertebral disc causing such symptoms of knife cutting inside your stomach.