The weakness may be due to anaemia,  they feel fatigue and restless , on top of that  asthma is significant health concern for him , need more detailed history , recent chest x ray , medications he is taking .

Need detailed medication history

Hello, I understand your concern for your father. At his age, with a history of asthma, breathing issues, cough with phlegm, and low hemoglobin, weakness and breathlessness can have more than one contributing factor: Possible reasons • Anemia: Even after transfusion, hemoglobin is still on the lower side, which can cause fatigue and weakness. • Asthma/airway disease: Cough with phlegm and breathing difficulty may indicate poorly controlled asthma or another lung condition. • Age-related changes & nutrition: These can further worsen energy levels and recovery. What can help • Ensure he continues his prescribed asthma medications/inhalers regularly. • Adequate hydration may ease phlegm clearance. • A nutritious, protein-rich diet will support strength and blood levels. • Regular follow-up with his treating doctor is important to monitor hemoglobin, iron levels, and overall health. Wishing your father better health and recovery. — Dr. Neelesh Guttikonda MD Pulmonary Medicine | Fellowship in Interventional Pulmonology

Pl consult with detailed history.

Pls consult a pulmonologist for better understanding and medication

hi..please share his current xray..also his iron status