Thickened toenails are commonly caused by aging and injuries that lead to fungal infections, according to Footsmart. As people age, their toenails become thicker, while injuries can cause the toenails to split. Both cond... More » Health Conditions & Diseases

According to WebMD, a nail fungus develops when a microscopic fungus enters into the nail, and if the fungus causes an infection, the nail thickens and becomes discolored. Nail fungus infections are more likely to develo... More »

To safely trim thick toenails, soak the nails in warm water, and use an emery file on the nails followed by a trimmer. Toenails typically harden and thicken naturally with age, but thick toenails can occur at any time. More » Beauty & Fashion Nail Care

Some natural remedies for thick toenails caused by fungus include diluted tea tree oil, coconut oil and baking soda mixed with vinegar, according to Everyday Roots. Prevent nail fungus from reoccurring by keeping feet cl... More » Health Conditions & Diseases

Factors such as old age, genetics, injuries, infections or being overweight contribute to over 100 different types of arthritis, explains WebMD. The two most common kinds of arthritis are osteoarthritis and rheumatoid ar... More » Health Conditions & Diseases

WebMD and Healthline explain that the exact causes of mouth ulcers are unclear as of 2014; however, several factors are known to relate to incidence of mouth ulcers, including stress, tissue damage, acidic foods, minor i... More » Health Conditions & Diseases

The causes of swelling after back surgery are blood clots and infections, states the University of Maryland Medical Center. Infections occur in the incision area, either at the surface or in the deep tissue, and are acco... More »