Is someone who dies of suffocation from a respiratory illness considered a martyr, and is nosebleeds at the time of death a sign of a good ending?

The martyrs of the Ummah are many, such as one who dies in the way of Allah, or defending his property and honor, and the one who dies of a plague, or by drowning, or pleurisy, or an internal disease, or by fire, or under a collapsed building, and the woman who dies during childbirth.

There is no Shar’i (Islamic legal) evidence that one who dies of suffocation due to shortness of breath is a martyr. The texts mention martyrdom in the context of being killed in the way of Allah, plague, childbirth, burning, drowning, tuberculosis (consumption), and abdominal illness. Tuberculosis is a disease that affects the lungs.

The rank of martyrdom is a special status with Allah, and not everyone who dies from an illness attains it, except for those specified in the texts.

There is no Shar’i evidence that a nosebleed at the time of death is a sign of a good ending.