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Symptoms: Where to Start

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Common medical causes behind symptoms like fatigue, weight changes, low libido and poor sleep, and when to get checked.

About This Topic

Why Symptoms Rarely Have Just One Cause

Fatigue, weight changes, poor sleep and low libido are some of the most common reasons adults seek care, and each can have more than one cause. Hormones, thyroid function, blood sugar, nutrient levels, sleep, stress and medications can all play a part, sometimes at the same time.

These articles start with what you are noticing and explain the common medical causes, what an evaluation usually looks at and when a symptom is worth getting checked. They are meant to help you have a more informed conversation with a provider, not to replace one.

Man on a couch rubbing his eyes, looking tired and unwell, illustrating common symptoms such as fatigue

Energy, Focus & Sleep

Fatigue, Brain Fog & Restless Nights

When Your Body Feels Different

Weight, Libido & Hot Flashes

Getting Evaluated

When Symptoms and Labs Disagree

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Functional Medicine in Lake Forest

A whole-person evaluation that looks at your symptoms, history and labs together to understand what may be driving how you feel.