上昇（じょうしょう） means rising, ascending, or increasing. It is used for physical height and numbers, such as altitude, temperature, prices, ratings, and economic figures.
It often suggests an upward trend, not just one small move up.
上昇 is a formal, news-style word. In everyday conversation, 上がる（あがる） is usually more natural.
Do not confuse it with 向上（こうじょう）. 上昇 is for height or numbers going up. 向上 is for improvement in quality, skill, or ability.
The opposite is 下降（かこう）, meaning descent or decline.
Common related terms include 急上昇（きゅうじょうしょう） for a sudden rise, 気温の上昇（きおんのじょうしょう） for rising temperatures, and 運気上昇（うんきじょうしょう） for luck going up.