Which of the following symptom is likely to be of organic origin?
**Core Concept**
The question requires the student to differentiate between psychological (functional) and organic (physical) symptoms in a clinical context. Organic symptoms have a clear physiological basis, whereas functional symptoms are often psychological or psychiatric in origin.
**Why the Correct Answer is Right**
The correct answer is likely to be a symptom that has a clear physiological basis, such as pain or weakness, which can be localized to a specific area of the body. For example, a patient complaining of unilateral weakness of the face (hemiparesis) is more likely to have a physical cause, such as a stroke, than a functional cause, such as conversion disorder.
**Why Each Wrong Option is Incorrect**
* **Option A:** Complaints of fatigue or lack of energy are often functional symptoms, as they can be subjective and difficult to quantify. They may be related to depression, anxiety, or other psychological factors.
* **Option B:** Headaches can have both organic and functional causes, but are often difficult to diagnose as purely organic. Tension headaches, for example, are often functional in origin.
* **Option C:** Difficulty concentrating or memory loss can be symptoms of a variety of conditions, including depression, anxiety, or cognitive impairment due to a medical condition. However, they are often functional symptoms rather than purely organic.
**Clinical Pearl / High-Yield Fact**
When evaluating patients with symptoms that suggest an organic cause, it's essential to take a thorough medical history, perform a physical examination, and order relevant diagnostic tests to rule out underlying medical conditions.
**Correct Answer:** D.