An infinitive without a 'to' attached is called a bare infinitive.
The following is thought to be one of the reasons stress damages the stomach's mucous membrane.
Female hormone imbalance is a major cause of infertility.
This is international common sense, the great principle of resource management.
I tried thinking about why it was that I didn't trust him.
I've got to find the cause quickly, get out of this slump and live up to Mr. Tanizaki's expectations.
Due to this a lot of time was lost, it's possible that if it wasn't for this accident the final stage of the race would have been better.
How brave of you to go alone into the primaeval forest!
The verb 'help' takes to-infinitives and bare infinitives but bare infinitives are said to be the most common in casual text; as also used in this example sentence.
When I looked at the explanatory notes under the posts list I realized what was causing it.
I would like to draw your attention to the fact that Kanjisho uses multiple sources of data provided by third parties.
The search results are provided by the wonderful Jisho API which itself uses various data sources which you can find on the jisho's website. The data concerning the kanji strokes are provided by the KanjiVG project, under the CC BY 3.0 FR license. I also use Tatoeba to provide example sentences and Kuroshiro to obtain the furiganas and romajis versions of the sentences.
If you find any vices, errors or malfunctions, please let me know so that I can correct them.