Correlation dose not imply causation, The fact that A always implies B, or that A always imply each other, is insufficient to conclude that A must cause B.
1. Another element could be the cause.
When the argument concludes that one phenomenon must be caused by another, the fist thing that you should identify are any plausible alternate causes. Theses can present in two different forms: 1. another element may be responsible for the effect in question, or 2. another element may be responsible for both the purported cause and the effect.
2. Reversing cause and effect
When two things are correlated, a common mistake is to assumes that one must be the cause when the other could be. When evaluating a cause conclusion, one should always check to see if the cause and its effect can be reversed.