A woman was robbed while having a seizure in the back of a cab in Chelsea, police said.

The cruel thieves snatched the stricken 22-year-old woman’s purse through the cab’s open window while the woman was suffering a seizure about 5 a.m. Aug. 21 at Eighth Avenue and West 21st Street in Manhattan, cops said.

The woman’s purse contained a Rolex watch worth nearly $25,000, as well as a Visa card, NYPD said.

Three witnesses said the thugs then fled on foot, according to authorities.

No arrests have been made.