When I walk up the stairs I get like short of breath, out of breath it''s like the same steps that I normally walk up or run up no problem but now it''s like horror to do; Affecting my breathing; Breathing changed; It was different, breathing was different; out of breath; Felt like someone was pushing, pressing down on my chest; I am having asthma issues now; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  A 56 year-old female patient received bnt162b2 (BNT162B2), administered in arm left, administration date 21Sep2021 (Batch/Lot number: unknown) at the age of 56 years as dose 1, single for covid-19 immunisation. Relevant medical history included: "Hypertension" (unspecified if ongoing), notes: Verbatim: Blood pressure high; "Heart murmur" (unspecified if ongoing), notes: Verbatim: Heart murmur; "I am a person who has asthma" (unspecified if ongoing), notes: I am a person who has asthma. Concomitant medication(s) included: AMLODIPINE taken for hypertension.  The following information was reported: DYSPNOEA (non-serious) with onset 22Sep2021, outcome "unknown", described as "When I walk up the stairs I get like short of breath, out of breath it''s like the same steps that I normally walk up or run up no problem but now it''s like horror to do"; DYSPNOEA (non-serious) with onset 21Sep2021, outcome "unknown", described as "Affecting my breathing; Breathing changed; It was different, breathing was different"; DYSPNOEA (non-serious) with onset 21Sep2021, outcome "unknown", described as "out of breath"; CHEST DISCOMFORT (non-serious) with onset 21Sep2021, outcome "unknown", described as "Felt like someone was pushing, pressing down on my chest"; ASTHMA (non-serious) with onset 21Sep2021, outcome "unknown", described as "I am having asthma issues now". The events "when i walk up the stairs i get like short of breath, out of breath it''s like the same steps that i normally walk up or run up no problem but now it''s like horror to do", "affecting my breathing; breathing changed; it was different, breathing was different", "out of breath", "felt like someone was pushing, pressing down on my chest" and "i am having asthma issues now" were evaluated at the physician office visit. Relevant laboratory tests and procedures are available in the appropriate section. Therapeutic measures were not taken as a result of dyspnoea, dyspnoea, dyspnoea, chest discomfort, asthma.  Additional information: patient did not took any vaccine prior to 4 weeks of covid vaccine. Patient stated that after the first shot, 30 minutes after the shot, my breathing changed, felt like someone was pushing, pressing down on my chest, it wasn't, I walked upstairs and I was out of breath like shortness of breath and just it was different, breathing was different from before I got the shot. She said, I don't think it is here anymore but I am a person who has asthma. So, now, it is the allergy season, so whatever the mold and (word not clear), I am having some breathing issues but it stopped for a while but now, it is the allergy season, I am having asthma issues now (captured as event, since further clarification was unknown).  Follow-up (01Dec2021): This follow-up is being submitted to notify that the lot/batch number is not available despite the follow-up attempts made.   Follow-up attempts completed. No further information is expected.