I wondered the same thing and they say it's okay if it's on the lowest setting just don't leave it on too long you don't want to raise your body temp

A hot water bottle and a cozy bath are completely acceptable. Neither can raise your body temperature enough to cause any problems.

It's fine:) it's only unsafe if your raising your body temp, like taking too hot a bath or being under an electric blanket too long... I don't think a heating pad for any amount of time can change your core body temp. You're good!

Yeah i used to heat up my rice bag and it laid on me until it got cold and I'd do it again

I always fill up my hot water bag and its laying here all night long. Eases the pain really fast and just feels super cozy

I sure use mine all the time I hope its okay lol..I just try not to let it stay for too long so it don't get too hot in there

I think there is but I'm not sure the limit :/

@savannamarie, there's no limit to how long?

Yes it's fine