When your symptoms suggest that "it's probable" that you have a particular disease, what word do we usually use in English to suggest so?

Solution 1:

Neither sounds natural. The natural expressions are:

a) "be symptomatic of" - A fever's refusal to respond to antibiotics is symptomatic of a viral infection.

b) "be indicative of" - A fever's refusal to respond to antibiotics is indicative of a viral infection.

Of the two, the former is slightly more precise and formal.

Compare the Farlex medical dictionary:

symptomatic indication - "An indication provided by the symptoms of a disease rather than because of precise knowledge of the actual disease process. For example, a patient may be given acetaminophen without knowing the cause of the symptoms of headache or fever."

To use your example, the sentences would be:

"You have hyperinflation in both your lungs, which is symptomatic of asthma."

"You have hyperinflation in both your lungs, which is indicative of asthma."