Comprehensive Guide to Disease X Symptoms 

Fever 

Elevated body temperature, often indicating an immune response to infection. 

Fatigue 

Feeling of extreme tiredness or weakness, which can affect daily activities. 

Cough 

Forceful expulsion of air from the lungs, often accompanied by mucus or other substances, which can be a sign of respiratory irritation or infection. 

Respiratory symptoms 

Difficulty breathing, shortness of breath, or other issues related to the respiratory system, which can indicate involvement of the lungs. 

Body aches 

Generalized discomfort or soreness in muscles and joints, often accompanying infections. 

Headache 

Pain or discomfort in the head or upper neck region, which can be a symptom of various illnesses, including infectious diseases. 

Rash or other skin manifestations 

Changes in skin texture, color, or appearance, which may include rashes, lesions, or eruptions, suggesting involvement of the skin in the disease process. 

Gastrointestinal symptoms 

Nausea, vomiting, diarrhea, or abdominal pain, which may indicate involvement of the digestive tract and can lead to dehydration.