Depending on your mix and/or how broken down it is, lots of different types of critters set-up home in it. There are lots of nematodes and earthworm relatives (and sometimes even earthworms themselves) that can thrive in the pots of cultivated plants, and there are some "worm-like" insect larva that could be the culprit. Without photos and/or accurate, detailed notes, it's not going to be possible to narrow it down much further. I will say that these types of things are typically detritivores or predators of detritivores, and are harmless to humans.
I know cymbs are often fine with some soil around their roots, which provides a habitat for worms. However, the worms can be a sign that your mix is breaking down, so repotting may be in order. Certainly, if you repot the plant into fresh new mix and take care to thoroughly wash the roots, you'll at least put a major dent in the population, if not eradicate it entirely. Otherwise, you can flush the pot out with lots of water, and maybe leave it sitting, fully submerged for a bit to try and drown as many out as possible. You might have to repeat this treatment regularly since it's most likely never going to flush out all the critters.
Although I do not recommend it, if you're really serious about getting rid of the worms, many types of synthetic insecticides are toxic to earthworms and their relatives. I feel that the risks, however small, from using an insecticide or any other chemical to kill the worms is unwarranted since the worms themselves are harmless to people, and can be kept in check with other measures.
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