(CNN) -- Heat in the Northeast has taken at least six lives, health officials say. Five have died in Maryland over the course of the summer of heat-related causes; one man died last week in New York.
A heat wave has been hanging over the northeast and the Midwest since early this week, driving up the heat index over 100 degrees in many places.
Extreme heat can be a major cause of death, and health officials warn that the elderly, children and people with cardiovascular conditions stay cool and drink plenty of water.
CNN's AnneClaire Stapleton contributed to this report