What Causes Black Stool With Mild Pain In Lower Abdomen?

Posted on Mon, 2 May 2016

Medically reviewed by Ask A Doctor - 24x7 Medical Review Team

Mon, 2 May 2016 Answered on

Thu, 16 Jun 2016 Last reviewed on

Question : I have started taking iron tablets and have very black stools. The side effects say that this is normal. Also I have been passing large black stools at least 3 times a day which is unusual for me. I have mild pain in my lower back and bottom of my stomach. Is there any need to see a doctor soon.

Answered by Dr. V. N. S. Parinam (13 minutes later)

Brief Answer:
Needs investigation immediately

Detailed Answer:
Hello XXXXXXX

Though black stools while taking iron supplements is normal, it is very unusual to have pain in the lower back and bottom of stomach.

I could see that you are already on codein plus acetaminophen. Did you take any over the counter pain killers recently or earlier to co codamol? You have erosive gastritis and I suspect it can bleed into the gut any time. The mucosal lining would be irritated with iron supplements.
The new symptoms calls for an investigation as soon as possible.
You should see a doctor as quickly as possible.

Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar

Follow up: Dr. V. N. S. Parinam (15 minutes later)

Thanks for this information Doctor. It is a bank holiday today in the UK. Can I wait until Tuesday to see a doctor or do you suggest that I go to A&E. In other words should I stop taking any tablets today and is there any threat to me by waiting 24 hours.

thanks XXXXXXX

Answered by Dr. V. N. S. Parinam (21 minutes later)

Brief Answer:
Depends on the severity of symptoms

Detailed Answer:
It is up to you to wait and then seek a doctor's care.
It all depends on your symptoms if they are progressing you should seek at any point the A&E. You may stop taking Iron supplements in the mean time.

Wish you quick recovery.

Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar