Capt. Ken O'Donnell of the Concord said about 12:25 p.m. on Thursday, a 20-year-old woman fell while jogging along Thoreau Street and Sudbury Road.
O'Donnell said the department got a call that "someone collapsed and was laying down."
O'Donnell said the woman fainted and doubled over near O'Donnell said she was wearing jogging attire.
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"When we got there, people were around her, assisting her," O'Donnell said.
The woman was conscious and alert, he said.
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She was transported by the fire department to Emerson Hospital as a precaution, O'Donnell said.
Police officers directed traffic around the accident scene on the busy streets.
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