The medical term for gray nails is onychomycosis, a condition caused by dermatophytes that invade the nail plate or under the nail. If you have onychomycosis during preparation for pregnancy, you can treat your nails with topical topical medication and avoid taking it orally. Nail fungus is due to nail lesions caused by fungal infection, belonging to the superficial fungal infection, usually does not affect the preparation for pregnancy, the patient can use cyclopiazepine ointment, amorphophallus ointment and other drugs to treat gray nails during the preparation for pregnancy. Such drugs have less effect on the fetus. Patients with onychomycosis should pay attention to local hygiene during the use of medication, can be treated with iodophor disinfection to prevent infection, and pay attention to the local care of the feet at the same time. Eat less spicy and stimulating food, avoid drinking alcohol, pay attention to a balanced diet, timely supplementation of nutrients. Usually pay attention to rest, avoid overwork. It is recommended that patients go to a regular hospital in time, under the guidance of the doctor for standardized treatment, the use of drugs need to follow the doctor’s instructions, to avoid blind self-medication.