Symptoms & Causes: Understand What Your Body May Be Telling You
Symptoms such as headache, fever, tiredness, dizziness, cough, hair loss, weight loss, joint pain or frequent urination can have many possible causes. Sometimes the explanation is temporary and uncomplicated. At other times, persistent, severe or unexplained symptoms need medical assessment and selected investigations.
The QXL Symptoms & Causes Health Hub answers four questions clearly:
Clinical principle: Laboratory tests should support a clinical assessment, not replace it. A symptom alone is not a reason to order every available test. Always consult a qualified healthcare professional before requesting investigations.
Headache
Why Do I Have a Headache?
Fever
Causes, Warning Signs & When Tests May Be Needed
Cough
Causes, Types, Tests and Warning Signs
Fatigue & Tiredness
Why Am I Always Tired?
Dizziness
Why Do I Feel Dizzy?
Hair Loss
Why Is My Hair Falling?
Unexplained Weight Loss
Why Am I Losing Weight Without Trying?
Chest Pain
Causes, Tests and Emergency Warning Signs
Shortness of Breath
Why Am I Breathless?
Stomach Pain
Why Does My Abdomen Hurt?
Nausea & Vomiting
Why Do I Feel Sick?
Diarrhoea
Why Do I Have Loose Motions?
Joint Pain
Why Do My Joints Hurt?
Body Pain & Muscle Aches
Why Does My Whole Body Hurt?
Swelling of Feet, Ankles or Face
Why Am I Retaining Fluid?
Frequent Urination & Excessive Thirst
Why Am I Peeing So Often?
Numbness & Tingling
Why Do My Hands or Feet Feel Pins and Needles?
Skin Rash & Itching
Why Is My Skin Itchy or Breaking Out?
Recurrent Infections
Why Do I Keep Getting Sick?
How to Use These Articles
Start with the symptom that best matches the problem. Each page explains common causes first, then important less-common causes, red flags, tests that may be considered, and related QXL health topics. Emergency symptoms are clearly separated from non-urgent laboratory pathways.
QXL's Approach to Symptom-Based Testing
Not: Symptom → buy a large test package
Medical Review
Medically reviewed by:Dr. Shantakumar Muruda, MD - Medical Biochemistry; Founder & CEO, QXL Diagnostics Super Speciality Lab, Bengaluru
Last medically reviewed: 2026-09-11
Medical Disclaimer: This information is intended for general health education and does not replace consultation, diagnosis or treatment by a qualified healthcare professional. Seek urgent medical attention for severe, sudden or rapidly worsening symptoms or any emergency warning signs described on the individual symptom pages.