If you need urgent care here are your options:
If you are experiencing a medical emergency, call 911 to reach local EMT services.
Mountain Medical Urgent Care has offices in Lake Placid and Saranac Lake. Lake Placid location is open weekdays 9-6. Saranac Lake is open 8-8 weekdays and 10-6 weekends. They are fine with walk-in patients, so just get in the car and go.
The closest 24×7 emergency room if you are in Keene Valley is at the Elizabethtown Hospital. For those in Keene, it may be faster to go to the ER in Lake Placid (only from 8am to 11pm). There are emergency rooms in Saranac Lake at Adirondack Health and in Plattsburgh at CVPH, which is part of the University of Vermont Health Network.
Mountain Health Center in Keene is open 5 days a week. Call 518-576-9771 for an appointment.
This page of the Essex County Public Health web site offers links to many health services like quiting smoking, mental health, substance abuse, and so on – what they call community connections for a wide array of health issues.