According to CBS News, a woman was suffering from persistent headaches before doctors finally discovered a cerebrospinal fluid leak in her spine which caused the pain unless she was lying down.

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Normally, such a leak can be caused by surgery, an accident or even high pressure in the skull, but this time, according to researchers at The Journal of Medical Case Reports, said it may have been caused by her Pilates class, in which participants stretch and do resistance exercises on a platform with straps and ropes.

The woman said she felt a strange pop in her neck but showed no visible signs of injury.  An hour later, however, she started getting a headache that went away only when she lay down.

Her doctor diagnosed a neck muscle injury and prescribed medication to relieve the pain.  But the headaches got worse.

Finally, CBS reported, after a month of doctors' visits, scans showed fluid gathering outside of the spine and a tear in the lining of her spinal cord.

After two weeks of treatment that included bed rest, anti-inflammatory medication like ibuprofen and caffeinated beverages, the woman recovered.