This means:
“There are nine possible symptoms associated with diabetes that may be particularly noticeable during the nighttime.”
Breakdown
“9 signs of diabetes” = nine symptoms that could potentially be associated with diabetes.
“That appear at night” = suggests these symptoms may occur or become more noticeable while you’re sleeping or during the night.
The headline doesn’t reveal the nine signs, which creates curiosity and encourages people to click.
Examples of nighttime symptoms
Some diabetes-related symptoms can become noticeable at night, such as frequent urination and increased thirst, which can disturb sleep. High or low blood glucose can also cause symptoms such as sweating, shakiness, or confusion, particularly in people taking certain diabetes medications.
However, nighttime symptoms alone don’t diagnose diabetes. Diabetes is diagnosed using blood-glucose testing rather than symptoms alone.
Tone
This is a health-awareness/clickbait headline. The number “9” and the phrase “appear at night” make it sound like there are specific hidden warning signs.
A more accurate version:
“Nighttime symptoms that can sometimes be associated with diabetes—and when to get tested.”
