Washing dishes does not directly cause your fingernails to grow. Fingernail growth is primarily determined by factors such as genetics, age, overall health, and hormonal influences. The growth of nails is a natural process that occurs as new cells are produced at the nail's base (the matrix) and push the older cells forward, resulting in the extension of the nail.
It's possible that the idea of washing dishes making your fingernails grow might be a misunderstanding or a coincidence. Daily activities, including washing dishes, involve using your hands and nails frequently, which can inadvertently make you more aware of your nail growth. The nails might seem to grow faster or more noticeable when they are regularly used and exposed during tasks like washing dishes, typing, or other manual work.
In reality, these activities don't directly impact the rate of fingernail growth; they only draw your attention to it. Factors like a healthy diet, proper nail care, and good circulation in the fingers can contribute to maintaining strong and healthy nails. If you notice that your nails are growing at an unusual rate or have concerns about their health, it's a good idea to consult a healthcare professional or dermatologist to rule out any underlying issues.