Wearing flip flops is one of the causes of heel pain.

Walking in flip flops is one of the causes of heel pain
Although there are many causes of heel pain, including reactive arthritis, Achilles tendonitis and other injuries and conditions, wearing flip flops for extended periods of time can also be one of the causes of heel pain and is damaging to your overall foot health.
But I like flip flops. Can I still wear them even if they're one of the causes of heel pain?
Yes, but they are "only acceptable for short-term use if they have at least some arch support, a cushioned sole and supportive straps," Dr. Cunha says. "These type of flip flops are appropriate to wear at the beach, around swimming pools, in communal bathing facilities and locker rooms at the gym, or around the house."When in doubt, go for summer slide shoes to avoid heel pain
Dr. Cunha states that summer slide shoes should be your go-to for avoiding heel pain. Like flip flops, they’re convenient and easy to slip on and off, but unlike flip flops, they're more supportive and won't be one of the causes of heel pain you may experience this summer.
Not all summer slide shoes can stop the causes of heel pain
Dr. Cunha cautions against wearing summer slide shoes that are "completely flat, as they will contribute to [longer] pronation and collapse of the arch, which may [lead] to plantar and posterior heel pain, shin splints, knee pain and back pain."Dr. Cunha recommends the following flip flops for people who just can't let go
If you still want to wear your beloved flip flops, but don't want it to be one of the causes of heel pain, Dr. Cunha recommends the VIONIC Bella II Sandals, which have a footbed that "absorbs shock and reduces stress on feet, ankles and knees." (All of VIONIC’s shoes are made to promote arch support.)"These flip flops," he says, "are the only ones to have the approved seal of acceptance by [the] American Podiatric Medical Association."