Phlegm production can be due to an upper or lower respiratory infection. Upper respiratory infections include: sinusitis, rhinitis, pharyngitis, tonsillitis and laryngitis. Beside phlegm production, these infections are usually followed by other symptoms, too. A headache and stuffy nose are present during sinusitis, for example; a runny or stuffed nose and sneezing is frequent during rhinitis; sore throat and coughing are present during pharyngitis and tonsillitis; and a cough and disturbed speech are symptoms of laryngitis.
Lower respiratory infections include: tracheitis, bronchitis, bronchopneumonia and pleuritis. Phlegm production is typical for the first three disorders. Phlegm production without a cough is not logical. You can't expel the phlegm without the cough. You've reported that the X-ray is negative for tracheitis and bronchitis. Therefore, the phlegm should be microbiologically examined not only for tuberculosis but for other bacteria too.
You can consult a pulmologist to follow up.
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