Walkers are being advised to take extra care after the recent storms battered parts of the South West coastpath.
Water has weakened some parts of the coastline, which could cause landslips.
Police and other agencies said the adverse weather has made some spots potentially dangerous and have urged people not to take any unnecessary risks.
In extremely bad weather, the public are being advised to avoid the coastline altogether due to the threat of big waves.
Inspector John Livingstone, of Devon and Cornwall Police, said: “Don’t underestimate the power of the weather.
“We are asking people to be sensible and don’t do anything that puts your life in danger.”
A spokesman for the Maritime and Coastguard Agency echoed the plea and asked walkers to take note of any warning signs that are in place.
He added: “HM Coastguard’s advice is simple: don’t take risks. But if you do venture out on to the water, check the prevailing weather conditions and make sure that you can handle them. If in doubt, don’t go out.
"Some sections of the coast around the UK are particularly vulnerable to cliff falls and landslips. If you get into difficulty, or spot someone who might be in trouble, call 999 and ask for the Coastguard."