U.S. doctors online nowAsk doctors free
Newport Coast, CA
A 22-year-old female asked:

it's that time of the month for me and instead of my blood being red its dark brown. i am curious why that is and if i need to go see a doctor for it.

1 doctor answer1 doctor weighed in
Dr. Michael Sparacino
Family Medicine 37 years experience
See below: Brownish blood represents old blood. It's not dangerous and isn't a reason to visit your family doctor.

90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more. Get help now:

Ask doctors free
Personalized answers
Free
Talk to a doctor
24/7 visits
$15 per month

Similar questions

A 45-year-old member asked:

What is a blood group?

2 doctor answers3 doctors weighed in
Dr. Carolyn Thompson
Obstetrics and Gynecology 28 years experience
Blood type: "blood group" and "blood type" are the same thing. Blood types are as follows: a, b, o, and ab. There is also the rh factor, which is + or -. Blood types are inherited traits. Worldwide, o+ is the most common type, and ab- is the rarest type.
A 33-year-old member asked:

What's the biggest blood group in the world?

1 doctor answer1 doctor weighed in
Dr. Michael McGonigal
General Surgery 39 years experience
O+ is most common: O positive is the most common worldwide. The rarest is ab-.
A 32-year-old member asked:

Can your blood group affect your health?

1 doctor answer1 doctor weighed in
Dr. Nasfat Shehadeh
Hematology and Oncology 29 years experience
No: No.
A 37-year-old member asked:

Does "sc blood group" exist?

1 doctor answer1 doctor weighed in
Dr. Mehdi Moezi
Medical Oncology 31 years experience
SC Hemmoglobin: Yes it is not a blood group you may mean sc disease which is hemoglobinopathy and combination of sickcle and hemoglobin c and may need treatment an dhematology observation. Ask for referral to hematology.
A 33-year-old member asked:

How could blood groups originate?

1 doctor answer2 doctors weighed in
Dr. Ed Friedlander
Pathology 44 years experience
Genetic drift: There is no obvious selective advantage for A, B or O in nature, and these seem to be the result of random mutations. Some of the African blood groups, famously Duffy Negative, arise in response to selective pressure because it gives immunity to the local form of malaria. You may find this site helpful http://sandwalk.blogspot.com/2007/02/abo-blood-types.html

90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more. Get help now:

Ask doctors free
Personalized answers
Free
Talk to a doctor
24/7 visits
$15 per month
Last updated Mar 15, 2013

People also asked

Connect with a U.S. board-certified doctor by text or video anytime, anywhere.
24/7 visits
$15 per month

Disclaimer:

Content on HealthTap (including answers) should not be used for medical advice, diagnosis, or treatment, and interactions on HealthTap do not create a doctor-patient relationship. Never disregard or delay professional medical advice in person because of anything on HealthTap. Call your doctor or 911 if you think you may have a medical emergency.