Dr. Ann Haiden DO knows mast cell activation syndrome up close and personal. Over fifteen years ago she developed severe MCAS with symptoms that spanned across IBS, SIBO, multiple severe food and environmental sensitivities, asthma, neuromuscular symptoms, hypothyroidism, fatigue, brain fog, and stroke-like migraines. It was the painful eye-opening road she travelled on her way to discovering the beauty and restorative powers of functional medicine. Dr Haiden is also a two-time young breast cancer survivor, and experienced breast implant illness . She earned her Doctor of Osteopathic Medicine degree from Midwestern University. She sees patients at her functional medicine practice in Los Gatos, California.