Hi, welcome to the ehealth forum and I am glad to help you.
You seem concerned by the blood in stools one week after appendicectomy in your daughter.
The cause of blood in stools could be a possible gastritis after surgery stress or use of NSAIDs to control the post-operative pain could have led to the gastritis and the black stools or the blood in stools.Another possibility is of postoperative infection which is rare when aseptic precautions have been taken during the procedure or antibiotics have been used.
You must consult your surgeon for finding the accurate cause of blood in the stools as the same cannot be made online.
Hope this helps. Take care.
Note: This post is not to emphasise final diagnosis as the same cannot be made online and is aimed just to provide medical information and no treatment suggested above be taken without face to face consultation with health care professional
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