Speculation as to the state of the iconic Star Trek actor’s health arose after he was spotted in a wheelchair at a New York airport earlier this week.

In a tweet on Leonard Nimoy’s official twitter account stated:

Chronic obstructive pulmonary disease (COPD) is the name for a collection of lung diseases including chronic bronchitis, emphysema and chronic obstructive airways disease. 

People with COPD have difficulties breathing, primarily due to the narrowing of their airways, this is called airflow obstruction.

Typical symptoms of COPD include:

  • increasing breathlessness when active
  • a persistent cough with phlegm
  • frequent chest infections

The leading cause is listed as smoking.

Since retiring from convention appearances in 2011, Nimoy appeared in an Audi commercial with Zachary Quinto and Star Trek Into Darkness, as Spock (Prime)