"Overlapping symptoms" refers to when different medical conditions or diseases share similar signs or symptoms, making it difficult to distinguish between them based solely on those similarities. Full definition
For example, depression and anxiety share many overlapping symptoms and behaviors. (myplaytherapypage.com)
If you're a woman under 40, you recently gave birth, or are a man, or you already have a condition such as fibromyalgia, chronic fatigue, or an autoimmune disease, which have many overlapping symptoms with thyroid problems, your doctor simply may not order thyroid lab testing. (mindbodygreen.com)
Differential diagnoses of overlapping symptoms of more commonly known diagnoses that mask a dissociative disorder will be described, such as ADHD, psychosis, bipolar disorder. (anagomez.org)