What does the suffix '-algia' mean?

The suffix '-algia' is commonly used in medical terminology to refer to pain or discomfort. Option A, infection, is incorrect because the suffix '-algia' is not associated with infection. Option B, healing, is incorrect because the suffix '-algia' does not have a direct correlation with the process of healing. Option D, growth, is also incorrect because the suffix '-algia' does not indicate any kind of growth. Therefore, option C, pain, is the most appropriate and relevant answer.