"My ear is aching."
Translation:मेरे कान में दर्द हो रहा है।
There is no commonly used verb that is equivalent to 'to pain'/'to ache' in Hindi.
दर्द is a noun. So, taken literally, the Hindi sentence 'मेरे कान में दर्द हो रहा है' would translate to something like ' Pain is happening in my ear'.