Jenny Mollen took to Instagram Wednesday to share a shocking picture of her rapid weight loss, which she’s attributed to a thyroid issue.

The 38-year-old, who gave birth to her second baby six months ago, stripped naked for the shot, which she posted alongside a lengthy caption.

Mollen, who is married to “Orange Is the New Black” star Jason Biggs, wrote, “Not anorexia, it’s a thyroid issue. I don’t know what it says about me that I got this thin and didn’t think there was anything wrong.”

RELATED: Wendy Williams Opens Up About Horrific Graves’ Disease Battle Ahead Of Talk-Show Return: ‘There Was a Mess Going On Inside My Body’

She continued, “Last Friday, I had a bulge in my neck that finally got me to the doctor. I’m STILL waiting on blood work but my doc thinks it’s Graves.”

“If you just had a baby and have lost an inordinate amount of weight, feel like you are on cocaine, are suddenly heat intolerant, and can’t stop losing hair, and feel like your husband is being a d— it might just be your thyroid!! Get checked ASAP.”

Graves’ disease is described as “an autoimmune disorder that causes hyperthyroidism, or overactive thyroid.”

RELATED: Wendy Williams Takes Extended Leave From Talk Show To Address Graves’ Disease

Mollen’s latest post comes after she shared another pic of herself last Friday, with her addressing her weight loss once again in the caption.

The star explained that she’d been asked about her shrinking frame numerous times, but she didn’t really know what was going on.

See her full post below: