Paramedics took seven people to the hospital when they complained of suddenly feeling lightheaded after a stranger vomited at a Harlem subway station early Tuesday, cops said.

The FDNY and police briefly evacuated the E. 125th St. station on the 4, 5 and 6 line about 9:15 a.m.

A police source said someone threw up and the other people became ill from the smell of the vomit.

The victims, who were on multiple trains, complained of having difficulty breathing. They were taken to Harlem Hospital for evaluation as a precaution, officials said.

Trains bypassed the station until about 9:50 a.m. while the NYPD’s Emergency Services Unit conducted air quality tests.

The tests came back negative for toxins, according to the MTA.