Chest congestion is a common symptom of respiratory tract infections (like the common cold). Chest congestion is what happens when the mucus membranes (mucosa) that line your airways jump into overdrive. Mucosa cells are attacked and become irritated and inflamed because of some irritant you’ve breathed in (like dust, bacteria or a virus). Extra mucus (that’s thicker, too) is produced to flush out the intruder.
When you breathe, you inhale particles that are floating around in the air, like dust, allergens, bacteria or viruses. Usually these particles are trapped in the mucus that covers the mucus membranes of your nose and airways. Then tiny hairs called cilia transport the mucus (with the trapped particles) toward the throat. From there it can either be coughed out (also called “expectorating”) or swallowed.
But sometimes, particles like dust can irritate your mucus membranes or a virus or bacteria can cause an infection. This causes inflammation and results in extra mucus in your airways. This extra mucus is one of the ways your body tries to remove an irritant.
When there’s more (and thicker) mucus in your airways, your body may not be able to get rid of it in the usual ways (i.e. coughing it up or swallowing it). This is why you may start coughing more. Coughing is a way for your body to get rid of irritants in your airways or an accumulation of extra mucus that’s stuck inside your lungs.
 ANTIMONIUM TART 30-   Antimonium Tart is one of the leading homeopathic medicine for treatment of chest congestion. The prominent indication for using this medicine in chest congestion is excessive rattling of mucus in the lungs on coughing. The lungs seem to be  overloaded with mucus. But even on much coughing very little mucus is expectorated. There is difficulty in breathing and patient takes short breath to compensate for normal breathing. There are suffocative spells that force the patient to sit up . Chest congestion consequent to working in damp basements yields wonderfully well to this medicine. This medicine also possess great power to heal difficult respiration in babies occurring shortly after birth.
ARSENIC ALBUM 30-  Arsenic album is yet another wonderful medicine used in homeopathy to treat chest congestion. This medicine is mainly prescribed to those patients of chest congestion who suffer from suffocative spells mainly at night time.  Suffocation with difficulty in respiration is worse on lying down and better by sitting up. On breathing wheezing or whistling sounds in the chest are produced. The cough is better by taking warm drinks. Burning pains in chest may also be present. This medicine can be given in all such cases of chest congestion that have occurred after taking cold drinks.

IPECAC 30-- Ipecac is a  homeopathic medicine that gives excellent results where wheezing in chest is a prominent symptom. There is continuous violent cough. The chest is full of mucus but inspite of coughing none of it comes out. The patient feels suffocative with constricted feeling in chest. The face of patient turns bluish due to lack of oxygen as a result of suffocative spells. Expectorated mucus at times can be blood stained .Persistent nausea accompanies cough and chest congestion. Vomiting if present with chest congestion gives relief to patient .
PHOSPHORUS  200-- Phosphorus is an Important  homeopathic medicine for the treatment of chest congestion. This medicine is given to those patients who complain of chest pain  with chest symptoms . Pain is accompanied by burning in the chest. The patient requiring this medicine complains of constrictive, oppressed feeling in chest as if a weight is lying in chest. Cough is present that is worse by talking, laughing. Cold air worsens the cough and chest pain. The patient requiring homeopathic medicine phosphorus can also have strange symptoms – They desire cold drinks, ice creams and refreshing things like juice along with above symptoms
BRYONIA ALBA  30--Bryonia Alba is also an excellent natural homeopathic medicine that helps in relieving the chest congestion. The main indication for using this medicine is cough with difficult breathing . The difficult breathing is worse by slightest motion and better by rest. The patient feels a constant need to take a deep breath. The cough gets worse after eating, drinking or in warm room. This medicine has powerful effect in treating stitching pains in chest during inspiration. The chest pains are also worse while coughing. The patient has to hold the chest with hands due to severe chest pains on coughing. The expectorated mucus is thick. The mucus comes out only after much hawking. Thirst for increased quantity of water might also be present.
SENEGA  30--Senega is a top homeopathic medicine , mainly recommended in elderly people with chest congestion. The patient requiring this medicine complains of rattling of mucus in chest with oppressed feeling. The mucus from the chest needs much effort and comes out with great difficulty. The expectorated mucus is tough and copious. Extreme soreness is felt in chest.