As a user, I want the system to validate the following fields across modules,
So that data accuracy, consistency, and logical constraints are maintained:

Module: Visit Details

Chief Complaint Validation
Ensure the chief complaint field displays only values starting with the letter "C" and excludes starting from the 3rd letter.

Duration Validation
Validate that conditions like abdominal or chest pain are age-appropriate, especially for infants.

*Description Validation
*Restrict the description field to text-only input, rejecting numbers and special characters.

Module: Past History
Past Illness Sorting
Ensure past illnesses are listed in alphabetical order.

Past Illness Age Validation
Prevent conditions like cardiac surgery or HIV/AIDS for patients under 4 years of age.

Comorbidity Validation
Restrict conditions like diabetes to appropriate age groups.

Current Medication Validation
Validate that the current medication field accepts only predefined medication names, rejecting random or overly lengthy entries