United Kingdom, June 26 -- Bella Hadid battles "severe isolation and depression" whenever her Lyme disease symptoms flare up.

The 29-year-old supermodel has opened up on the mental struggle of dealing with the disease on a longterm basis after being diagnosed with the tick-borne illness in 2012 - admitting she feels devastated every time she's dealt a setback.

In a post on her Instagram page, she explained: "I wish it wasn't so intimidating and difficult to explain the pain/ exhaustion/ fatigue,/ anxiety/ brain fog insecurities that come with chronic illness / co infections/ mental health/ trauma etc.

"Leading to severe isolation and depression, especially over long periods of time. Especially when you try anything you can. You learn a...