Acute Bronchitis: This is the most likely diagnosis due to the common presentation of chest congestion and voice loss (hoarseness) in acute bronchitis, which is often caused by a viral infection.

Laryngitis: Inflammation of the larynx can cause hoarseness and is often associated with upper respiratory infections, which can also lead to chest congestion.
Sinusitis: Sinus infections can cause postnasal drip, leading to cough and chest congestion, and potentially affecting the voice.
Pharyngitis: Inflammation of the pharynx can cause throat pain and hoarseness, and is often accompanied by symptoms of an upper respiratory infection, including chest congestion.

Pneumonia: Although less common, pneumonia is a serious condition that can present with chest congestion and, in severe cases, affect the voice due to extensive coughing or respiratory distress. Missing this diagnosis could be fatal.
Epiglottitis: A severe and potentially life-threatening condition that can cause significant respiratory distress, hoarseness, and difficulty swallowing. It requires immediate medical attention.
Lung Cancer: In rare cases, especially in smokers or individuals with a history of smoking, persistent chest congestion and hoarseness could be symptoms of lung cancer. Early detection is crucial for treatment outcomes.

Vocal Cord Lesions: Polyps, nodules, or cysts on the vocal cords can cause hoarseness but are less likely to be associated with chest congestion unless there's an underlying condition affecting the respiratory system.
Gastroesophageal Reflux Disease (GERD): Chronic reflux can lead to hoarseness and, in some cases, chest congestion due to aspiration of stomach contents into the lungs. However, this would typically be associated with other symptoms of GERD.
Tuberculosis (TB): A chronic infection that can affect the lungs and cause symptoms including chest congestion and hoarseness, especially in immunocompromised individuals or those from areas with high TB prevalence.