3 doctors weighed in:

Why do my leg muscles burn as soon as i start riding a bike?

3 doctors weighed in
Dr. Larry Greenbaum
Internal Medicine - Rheumatology
1 doctor agrees

In brief: Claudication?

Perhaps this is just due to being out of shape, but i'm concerned that this might be a problem with the circulation in your legs.
If you also have this problem when you walk, you should see your doctor.

In brief: Claudication?

Perhaps this is just due to being out of shape, but i'm concerned that this might be a problem with the circulation in your legs.
If you also have this problem when you walk, you should see your doctor.
Thank
Dr. Daniel Quon
Surgery - Oral & Maxillofacial

In brief: Lactic Acid

If you have not been on a bike in a long time and feel the burn in the muscles it can be due to a Lactic Acid build up.
The muscles cannot get enough oxygen and an anaerobic metabolism occurs with a Lactic Acid production that produces the burning sensation.

In brief: Lactic Acid

If you have not been on a bike in a long time and feel the burn in the muscles it can be due to a Lactic Acid build up.
The muscles cannot get enough oxygen and an anaerobic metabolism occurs with a Lactic Acid production that produces the burning sensation.
Thank
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