Mast cell activation syndrome is a condition that causes mast cells to release an inappropriate amount of chemicals into your body. This causes allergy symptoms and a wide range of other symptoms.

Steffini Stalos, DO, FCAP, is a pathology and lab medicine physician. She is also the chief medical officer of the lab consultancy firm Blood Associates, LLC. Mean corpuscular hemoglobin concentration ...

Spotting new bumps on your body can leave you scrambling to find pictures of skin rashes to compare them against. While there’s a large range of things that can cause skin rashes, doing your best to ...

Colleen Stinchcombe is a health, environment, and outdoor recreation writer based near Seattle, WA. In addition to Health, her work has been published by SELF, Outside Online, Sierra Magazine, Lonely ...