Yes. There are no medically proven risks to microwaving. According to the World Health Organization, they're safe for cooking when used according to the manufacturer's instructions. Microwaves rarely leak radiation, and if they do, it's in extremely small amounts that are virtually undetectable.
If you're concerned, you might want to make sure your microwave is working properly and isn't leaking or hasn’t been modified or damaged. You also should keep the door seals clean. As an added safety precaution, stand a few feet away from a microwave oven when it's operating instead of directly in front of it, since microwave energy decreases greatly as you move away from the source of radiation.