What's causing this stripy side effect?

The pattern points to certain medications

A patient undergoing cancer treatment presented to oncologists seeking an explanation for these strange new striations, and they totally nailed it.

effect of chemotherapy on nails

The 42-year-old was diagnosed with non-Hodgkin’s lymphoma five months earlier and had undergone four cycles of chemotherapy.

Doctors noted a dark-brown discolouration (melanonychia) of his fingernails and two types of transverse white lines.

“The opaque-appearing transverse lines (long arrow) on the fingernails are called Mees’ lines (true leukonychia), and the more