Everything about Cough totally explained
A
cough, also known as
tussis is a sudden, often repetitive,
spasmodic contraction of the
thoracic cavity, resulting in violent release of air from the
lungs, and usually accompanied by a distinctive sound.
Coughing is an action the body takes to get rid of substances that are irritating the breathing passages. A cough is usually initiated to clear a buildup of
phlegm in the
trachea. Coughing can also be triggered by a
bolus of food entering the trachea rather than the
esophagus due to a failure of the
epiglottis. Frequent or
chronic coughing usually indicates the presence of a
disease. Provided the patient is a non-smoker and has a normal chest
X-ray, the cause of chronic cough in 93% of all patients is due to
asthma,
heartburn or
post-nasal drip. Other causes of chronic cough include
chronic bronchitis and medications such as
ACE inhibitors. Coughing can happen voluntarily as well as involuntarily.
Physiology
A cough is a protective, primitive
reflex in healthy individuals. The cough reflex is initiated by stimulation of two different classes of
afferent nerves, namely the
myelinated rapidly adapting receptors, and nonmyelinated
C-fibers with endings in the
lungs. However it isn't certain that the stimulation of nonmyelinated
C-fibers leads to cough with a
reflex as it's meant in
physiology (with its own five components): this stimulation may cause
mast cells
degranulation (through an asso-assonic reflex) and
oedema which may work as a stimulus for rapidly adapting receptors.
Cause
"Persistent cough can be debilitating, socially distressing, and adversely impair quality of life." One of the more common presentations to a medical practitioner is a dry cough. The common causes of chronic dry coughing include
post-nasal drip,
gastroesophageal reflux disease,
asthma,
post viral cough and certain
drugs such as
beta blockers,
ACE inhibitors and
aspirin. One of the causes of chronic coughing might even be
mouth breathing induced dryness in the throat. If a cough lasts for more than three weeks, multiple causes are likely and symptoms will abate only when all the causes are treated will the patient be symptom free. Individuals who
smoke often have a
smoker's cough, a loud, hacking cough which often results in the expiration of
phlegm.
In Third World countries, where endemic tuberculosis and HIV related lung disease predominate, structural damage of the airways often occurs with resulting chronic cough.
Coughing may also be used for psychological or social reasons, such as the coughing before giving a speech. This is known as psychogenic, habit or tic coughing, and may increase in frequency in social situations featuring conflict.
Given its irritant nature to mammal tissues,
capsaicin is widely used to determine the cough threshold and as a tussive stimulant in clinical research of cough suppressants.
Complications
The complications of coughing can be classified as either
acute or
chronic. Acute complications include
cough syncope (
fainting spells due to decreased blood flow to the brain when coughs are prolonged and forceful),
insomnia, cough-induced
vomiting, rupture of
blebs causing
spontaneous pneumothorax (although this still remains to be proven),
subconjunctival hemorrhage or "
red eye", coughing
defecation and in women with a
prolapsed
uterus, cough
urination. Chronic complications are common and include abdominal or pelvic
hernias, fatigue
fractures of lower ribs and
costochondritis.
Treatment
Coughs can be treated with
cough medicines. Dry coughs are treated with cough suppressants (antitussives) that suppress the body's urge to cough, while productive coughs (coughs that produce
phlegm) are treated with expectorants that loosen
mucus from the
respiratory tract. Centrally acting cough suppressants, such as
codeine and
dextromethorphan reduce the urge to cough by inhibiting the response of the sensory endings by
depolarization, or a dulling, of the
vagus nerve, the nerve leading from the brain stem and serving the chest area. A recent study indicates that, because of the presence of
theobromine in chocolate, 50 grams of dark
chocolate may be an effective treatment for a persistent cough.
During injections
Coughing during an
injection can lessen the pain of the needle stick caused by a sudden, temporary rise in pressure in the chest and spinal canal, inhibiting the pain-conducting structures of the spinal cord.
Psychological causes of Cough
Sometimes a cough can be found to have no apparent physical or medical cause. In these instances emotional and psychological problems are likely causes and the cough is often called a "
psychogenic cough" (also known as a "
habit cough" or "
tic cough"). However, other illnesses have to be ruled out before a firm diagnosis of psychogenic cough is made.
Psychogenic cough is thought to be more common in children than in adults. A possible scenario: psychogenic cough develops in a child who has a chronically ill brother or sister.
Social aspects of coughing
Coughing isn't always involuntary, and can be used in social situations. Coughing can be used to attract attention, release internal psychological tension, or become a maladaptive displacement behavior. It is believed that the frequency of such coughing increases in environments vulnerable to psychological tension and social conflict. In such environments, coughing may become one of many
displacement behaviors and/or
defense mechanisms.
Further Information
Get more info on 'Cough'.
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