Learn Finnish: Ylipaino aiheuttaa usein sydämen ylirasitusta. - Excess weight often causes overstrain of the heart.

The prefix yli- functions like "over-" or "excess" in English. When attached to the noun paino (weight), it creates ylipaino (excess weight). It is a highly productive prefix, meaning you will see it attached to many different words to indicate "too much" or "above".

Is ylirasitusta also an example of an yli- prefix word?

Yes, it combines yli- (over) with rasitus (strain or exertion) to mean "overstrain". In this sentence, the base word ylirasitus has the partitive ending -ta added to it.

Why is ylirasitusta in the partitive case here?

The verb aiheuttaa (to cause) generally takes a partitive object when the result being caused is an abstract concept, an ongoing condition, or an uncountable mass. Because "overstrain" is an abstract, uncountable state here, it must be in the partitive.

Why is the word order sydämen ylirasitusta instead of the other way around?

In Finnish, a genitive modifier like sydämen (the heart's) almost always comes directly before the noun it modifies. While English often uses "of the" after the noun (overstrain of the heart), the Finnish structure is strictly "the heart's overstrain".