The sputum is a little yellowish-black jelly-like when you cough deeply, and you should consider lung infections, such as Klebsiella pneumoniae infection and Aspergillus infection. 1. Klebsiella pneumoniae infection: acute onset, coughing, coughing up sputum, sputum is often brick-red jelly-like sputum, high fever, chills. 2. Aspergillus infection: Aspergillus occurs in immunosuppressed hosts, the clinical manifestations may be cough, cough sputum, often brownish-yellow sputum, with fever, may be accompanied by chest pain, hemoptysis, wheezing and other symptoms. When coughing up sputum a little yellowish-black jelly-like, you should immediately go to the local hospital to improve the blood routine, chest CT and other related examinations, after a clear diagnosis for further treatment.