Gastroesophageal Reflux Disease (GERD): This condition is characterized by the backflow of stomach acid into the esophagus, which can cause irritation to the throat, leading to a dry cough and a raspy voice. The chronic nature of the symptoms and the absence of other systemic symptoms make GERD a plausible explanation.

Allergic Rhinitis: Allergies can cause postnasal drip, which may lead to throat irritation and coughing. The itchy sensation could be related to allergic reactions.
Laryngopharyngeal Reflux (LPR): Similar to GERD, LPR involves the reflux of stomach acid, but it primarily affects the larynx and pharynx, leading to symptoms like a raspy voice and dry cough.
Vocal Cord Strain: Overuse or misuse of the voice can lead to strain on the vocal cords, resulting in a raspy voice and potentially a dry cough due to throat irritation.

Laryngeal Cancer: Although less likely, laryngeal cancer can present with symptoms such as a persistent cough, voice changes, and throat discomfort. Early detection is crucial for effective treatment.
Tuberculosis (TB): TB can affect the larynx and cause symptoms like a chronic cough and voice changes. Given its potential severity and the need for early intervention, TB should not be overlooked.
HIV Infection: Certain infections associated with HIV, such as oral thrush or Kaposi's sarcoma, can cause throat symptoms. Early diagnosis of HIV is critical for managing the disease.

Sarcoidosis: This autoimmune disease can affect various parts of the body, including the lungs and lymph nodes, and may cause symptoms like a dry cough and voice changes due to granulomatous inflammation in the larynx.
Relapsing Polychondritis: A rare autoimmune disorder that can cause inflammation of the cartilaginous structures, including those in the larynx and trachea, leading to symptoms like a raspy voice and cough.
Vocal Cord Lesions (e.g., polyps, nodules): These can cause voice changes and potentially lead to a dry cough due to irritation of the throat.