Essex Police briefly blocked the main road into Colchester Hospital while dealing with an incident.
A spokeswoman for Essex Police confirmed officers were at the scene after receiving reports concerning the safety of a woman.
Buses were diverted away from the hospital via Northern Approach Road, with tailbacks stretching as far as Mill Road and the A134.
The spokeswoman said a woman is now in the care of health professionals.
The road reopened shortly after 3.30pm.
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