Categorize this medical condition.
The patient has fever, nausea, worsening headaches, and difficulty breathing.
This appears to be a respiratory illness. The specific condition may potentially be pneumonia, influenza, or even COVID-19, among other illnesses. However, a medical professional should be consulted for an accurate diagnosis.
Complete the following task based on the instruction and optional input provided.### Instruction:
Categorize this medical condition.

### Input:
The patient has fever, nausea, worsening headaches, and difficulty breathing.

### Output:
This appears to be a respiratory illness. The specific condition may potentially be pneumonia, influenza, or even COVID-19, among other illnesses. However, a medical professional should be consulted for an accurate diagnosis.