So, the polar vortex is back.
A large part of the eastern half of the country will experience temperatures that are well below normal the next couple of days and sometimes sudden temperature changes can affect our health.
Dr. David Frid, a cardiologist at Cleveland Clinic, said cold snaps can affect the cardiovascular system.
"When the weather gets colder your body is trying to conserve the heat and in order to do that the blood vessels become somewhat more constricted," Frid said.
Frid said when blood vessels constrict, it may cause blood pressure to rise and blood to thicken, which increases the risk for blood clots.
Even a modest drop in temperature could potentially be hard on the heart.
One study in The British Medical Journal linked a fall of one degree Celsius, or about two degrees Fahrenheit, to 200 extra heart attacks over the following 28 days.
Cold, damp weather can also wreak havoc on our joints.
People may get increased arthritis pain or swelling when the temperature drops suddenly.
A quick change in the weather can also bring about migraines.
Dr. Stewart Tepper, an expert on headache pain at Cleveland Clinic, said about half of all migraine sufferers list weather as a trigger.
"We do try certain strategies for having patients take medicines in advance of a known weather front, but we don’t have an evidence base with which to make that judgment. Some of us use anti-inflammatories, some of us use triptans, or other kinds of medications that are known to either prevent or terminate migraines," said Tepper.
Things may not get better as the weather warms up. Increases in temperature may irritate eczema and can make it more difficult for people with lung disease to catch a breath.