Acute Laryngitis: This is the most common cause of a lost voice, often resulting from a viral infection. The fact that the voice has not returned after 2 weeks could indicate a prolonged or severe case, but it's still within the realm of a common, self-limiting condition.

Vocal Cord Lesions (e.g., nodules, polyps): Prolonged voice misuse or overuse can lead to the development of lesions on the vocal cords, which can cause persistent hoarseness or loss of voice.
Gastroesophageal Reflux Disease (GERD): Stomach acid reflux can irritate the vocal cords, leading to chronic inflammation and voice changes.
Allergies: Seasonal or environmental allergies can cause postnasal drip, leading to throat irritation and voice changes.
Hypothyroidism: This condition can cause vocal cord swelling and hoarseness.

Laryngeal Cancer: Although less common, laryngeal cancer can present with persistent hoarseness or voice change. Early detection is crucial for effective treatment.
Vocal Cord Paralysis: This can result from nerve damage due to surgery, trauma, or tumors affecting the nerves controlling the vocal cords.
Thyroid Cancer: Similar to laryngeal cancer, thyroid cancer can cause voice changes due to compression or invasion of the recurrent laryngeal nerve.

Relapsing Polychondritis: A rare autoimmune disorder that can cause inflammation of the cartilages, including those in the larynx, leading to voice changes.
Sarcoidosis: A condition that can cause granulomas in various parts of the body, including the larynx, potentially affecting the voice.
Amyloidosis: The deposition of amyloid proteins in the larynx can cause voice changes, though this is exceedingly rare.
Neurological Disorders (e.g., Parkinson's Disease, Multiple Sclerosis): Certain neurological conditions can affect the nerves controlling the vocal cords, leading to voice changes.